OBJECTIVE
COM LTW SAWKNO
Objective:
To review the precautionary landing procedure through a scenario-based exercise involving an electrical system
failure.
The aim is to apply structured decision-making and procedural discipline while selecting a suitable landing site and
executing a safe landing.
PRO WLM FPM FPA PSD
Competencies acquired at the end of
this student self briefing:
PRO FPA
FPM
Training Area of Emphasis:
• Accurate field selection and wind assessment
• Situational awareness and time management under system degradation
• Correct precautionary pattern and height management
• Communication, checklist use and cockpit discipline throughout the event
Expected Briefing Reading Time: 00:45
Training Syllabus compliant with EASA Exercise n° 17
DEFINITION
A Precautionary Landingis a planned landing made at the pilot’s discretion when continuation of flight may no longer be
considered safe due to degrading conditions or aircraft malfunction, even though a forced landing is not yet required.
It is not an emergency landing, but a preventive and controlled action taken while the aircraft remains fully flyable.
Typical causes may includes:
ICAO Definition: “A landing carried out when continuation of flight is inadvisable but not immediately hazardous.”
Technical
malfunctions:
electrical, fuel,
or engine system
degradation.
Deteriorating
weather or
reduced visibility.
Low fuel state
or uncertainty about
endurance.
Loss of navigation
or communication
capability.
Crew
incapacitation
or
physiological factors
(fatigue,
disorientation).
TECHNICAL
8.
INTRODUCTION
Scenario Case Study:
Duringa VFR navigation LILE-LIMB flight in a Tecnam P2008, cruising near the Mortara City area, the pilot experiences an
Alternator failure (ALT OUT) warning.
After checklist completion, the fault cannot be isolated and the alternator output remains offline.
The aircraft is now operating solely on battery power, with an estimated endurance of 20 minutes before electrical
depletion.
Consequences of the Failure:
• Potential loss of engine instruments and flight instruments
• Possible flap system inoperative at landing, if electrically actuated
• Possibile loss of radio communication (COM failure).
The pilot must apply the T-DODAR model for structured decision-making and coordinate all actions through proper
checklist use, communication and TEM management.
OPERATIONAL
9.
Abnormal situation
requiring deviation
fromnormal plan
TIME/NO TIME AVAILABLE CONTINGENCY
In this particular scenario, the event classifies as a Time-Available Emergency, therefore not an immediate threat to life,
but a degrading systems failure that will evolve into an urgency if mismanaged.
The pilot must use available time to contain workload, apply SOPs and ideally try to plan
the landing before the electrical system is exhausted. Priorirty always remains:
OPERATIONAL
1) FLY 2) NAVIGATE 3) COMMUNICATE
Impending
degradation
Immediate threat
PROBLEM
1) FLY
TIME
AVAILABLE?
YES
NO
MEMORY
ITEMS
READ
CHECKLIST
Use of applicable
memory items,
SOPs and
common sense
Use of applicable
Checklist, SOPs
and common
sense
CONTINGENCY
(PROBLEM)
URGENCY EMERGENCY
Priority
TEM
10.
CHECKLIST DISCIPLINE
Emergency checklistsare actions executed in response to abnormal or
emergency situations that demand immediate attention.
Their purpose is to control, contain and mitigate the effects of events that
threaten safety, checklists ensure control and structure under stress.
OPERATIONAL
They do not fly the aircraft: they ensure the pilot does not forget any
systematic step.
Each line represents a safety barrier against human error.
By applying the checklist methodically, the pilot transforms confusion into
sequence and ensures no critical step is skipped.
CONDITION CHECK. TYPE DESCRIPTOR
FIRE / SMOKE
MEMORY
ITEMS
Immediate critical actions. Must be executed from
memory without reference to printed material. Example:
electrical fire, engine fire, cabin smoke.
NO TIME
AVAILABLE
EMERGENCIES
MEMORY
ITEMS
Events requiring instantaneous action to maintain
control or safety. Pilot executes memorized steps
immediately.
ABNORMAL
CONDITIONS
(TIME
AVAILABLE)
READ & DO
Used when time and situational control allow. Pilot reads
each item and performs the action sequentially.
Example: alternator failure, flap asymmetry, .
EMERGENCY AND ABNORMALCONTINGENCY FLOW
The objective of the T-DODAR model is to support the flight crew in making clear, structured, and timely decisions during
abnormal or emergency conditions.
It provides a step-by-step framework that minimizes human bias, maintains situational awareness and promotes sound
decision-making under pressure. the time available:
TECHNIQUES
1) FLY 2) NAVIGATE
4)
COMMUNICATE
1° Priority
3) PROBLEM SOLVING
NO TIME
AVAILABLE
TIME
AVAILABLE
Perform
Memory Items
immediately.
Apply the
T-
DODAR process
to isolate,
diagnose, and
resolve the
issue.
Ensure safe
trajectory and
situational
awareness.
Inform ATC, crew,
and passengers
according to
priority.
Execute
applicable
procedures and
confirm results.
APPLY
RELEVANT
CHECKLIST
2° Priority
Although primarily used in aviation, the T-DODAR logic is adaptable to any high-stress or time-critical environment, where
systematic thinking is essential.
The Aero Club Milano Emergency / Abnormal Contingency Flow Chart defines how to act depending on the time
available:
13.
T-DODAR DECISION MAKINGMODEL
The structured model T-DODAR supports consistent reasoning under pressure.
TECHNIQUES
DIAGNOSE
OPTIONS
D
O
DECIDE
ACTION/ASSIGN TASKS
D
A
REVIEW
R
TIME?
T
ONLY IF TIME AVAILABLE PERMITS:
Time availble flow will be followed for
this scenario
14.
T-DODAR DECISION MAKINGMODEL DIAGNOSE
DIAGNOSE
D
• Indication: ALT OUT light illuminated.
• Ammeter shows discharge; voltage trending down.
• If the event of the appropriate checklist “ALT OUT” executed from Aircraft Flight Manual (AFM) with alternator
reset unsuccessful:
• Fault confirmed not isolated. Electrical power now limited to battery supply only.
O D A R
What is the problem now? What kind of implications do I have now?
Estimated battery life:
20 minutes circa.
Possible declaration of urgency
early:
“PAN PAN”x3,
if still operational.
System degradation is
progressive:
Radio, Avionics and Flaps
may fail without warning.
D
I
A
G
N
O
S
E
I
M
P
L
I
C
A
T
I
O
N
S
15.
T-DODAR DECISION MAKINGMODEL OPTIONS
O
P
T
I
O
N
S
D O D A R
OPTIONS
Evaluate possible courses of action:
• Return to departure aerodrome, or,
• Divert to alternate aerodrome or appropriate field, or,
• Continue to destination.
Evaluation:
Always consider weather, aircraft status, aerodrome/airfield
status other than your operational limitations.
16.
T-DODAR DECISION MAKINGMODEL
OPTIONS/
DECIDE
For the decision making flow, following aerodromes (within range) are considered:
• Vercelli (LILE), Voghera (LILH), Biella (LILE), Casale (LILM), Malpensa (LIMC), Linate (LIML), Bresso (LIMB)
D O D A R
OPTIONS
17.
T-DODAR DECISION MAKINGMODEL
OPTIONS/
DECIDE
Bresso (LIMB): Familiar home base,
maintenance available, known circuit
and procedures, adequate runway
length (1080m asphalt).
D O D A R
OPTIONS
Vercelli (LILE): Closest by distance, but
short runway (560m grass). With possible
flapless landing, surface and length
are unsuitable for this aircraft type.
Voghera (LILH): Closed by NOTAM (field
maintenance).
Biella (LILE): Acceptable length (1200m
asphalt) but further north, extending
exposure time beyond battery endurance.
Malpensa (LIMC): Suitable
infrastructure, but complex
commercial traffic and
coordination; risk of delayed
handling.
Linate (LIML): Similar to Malpensa,
high workload environment.
Casale (LILM): TAF indicates possible
deteriorating weather conditions,
which may affect visibility and safety
margins.
18.
T-DODAR DECISION MAKINGMODEL
OPTIONS/
DECIDE
For the decision making flow, following aerodromes (within range) are considered:
• Vercelli (LILE), Voghera (LILH), Biella (LILE), Casale (LILM), Malpensa (LIMC), Linate (LIML), Bresso (LIMB)
Bresso (LIMB): Familiar home base,
maintenance available, known circuit
and procedures, adequate runway
length (1080m asphalt).
D O D A R
OPTIONS
Vercelli (LILE): Closest by distance, but
short runway (560m grass). With possible
flapless landing, surface and length
are unsuitable for this aircraft type.
Voghera (LILH): Closed by NOTAM (field
maintenance).
Biella (LILE): Acceptable length (1200m
asphalt) but further north, extending
exposure time beyond battery endurance.
Malpensa (LIMC): Suitable
infrastructure, but complex
commercial traffic and
coordination; risk of delayed
handling.
Linate (LIML): Similar to Malpensa,
high workload environment.
Casale (LILM): TAF indicates possible
deteriorating weather conditions,
which may affect visibility and safety
margins.
E
V
A
L
U
A
T
I
O
N
Decision: Return to Bresso (LIMB) for a precautionary landing.
There is no “perfect” choice: What matters is the structured reasoning and use of all available information, such
as:
• Aircraft configuration (flapless expected).
• Remaining time and battery.
• Weather and visibility.
• Pilot familiarity and terrain.
• Traffic and coordination workload.
19.
T-DODAR DECISION MAKINGMODEL DECIDE
D O D A R
DECIDE
O
1) DECIDE
2) BE PREPARED TO ANY
CONTINGENCIES
• Set direct track from Mortara to Bresso (30 NM ca).
• Maintain VMC conditions and terrain clearance.
• Prepare the passenger and cabin for a flapless landing and possible Loss of COM:
• Brief how to cushion and actions after positive/hard landing, evacuation
required…?
• Maintain lookout
20.
T-DODAR DECISION MAKINGMODEL
ACTION/
ASSIGN TASKS
D O D A R
ACTION/ASSIGN TASKS
O A
Single-Pilot Operation (SPO): Workload & Communication:
• In single-pilot operation, the focus must be on mental workload distribution and communication clarity.
Passenger Briefing:
• In case of a diversion or precautionary landing, the PIC
shall give a short, reassuring passenger briefing.
It must include seat belts fastened, door operation,
brace position (head on cushion), and evacuation
procedure if required.
The briefing shall be calm, clear, and completed before
approach.
NITS Briefing
• The NITS briefing is a standardized communication
format used by flight crew to convey essential
information during abnormal or emergency
situations.
It provides a clear, linear structure to ensure that all
recipients (such as air traffic controllers, other crew
members, or passengers) receive the same critical
information in an organized and comprehensible
manner.
NATURE
N Description of the problem or malfunction.
INTENTIONS
I Planned actions by the pilot or crew.
TIME
T
SPECIALS
S
Estimated time available or required before landing or action.
Any additional special needs (e.g., emergency services, priority landing, technical assistance).
21.
RADIO COMMUNICATION DISCIPLINE
BothPAN PAN and MAYDAY are ICAO-standard radio distress signals, used according to the level of emergency:
• In this case, the pilot recommended transmition transmit:
• “PAN PAN, PAN PAN, PAN PAN, Milan Information, «I-ABCD», electrical failure, alternator out, battery endurance 20
minutes, returning Bresso, estimate in 15 minutes for precautionary landing, 2 POB, request to advice bresso radio of
our arrival”
e.g.: If the electrical situation deteriorates or an electrical fire develops:
• “MAYDAY, MAYDAY, MAYDAY…”
Then state: nature of emergency, intentions, position, altitude, and persons on board.
OPERATIONAL
Any situation may escalate to a «MAYDAY» or downgrade to a «PAN PAN» depending on the evolution of the
aircraft condition and flight safety assessment.
PIC shall reclassify the emergency level as appropriate and inform ATC accordingly.
PHRASE MEANING DESCRIPTOR PRIORITY
PAN PAN (×3) Urgency
A situation that could become dangerous but does not yet require
immediate assistance (e.g., alternator failure, partial loss of systems…).
Below distress
MAYDAY (×3) Distress
Serious and imminent danger requiring immediate assistance (e.g.,
total power loss, forced landing, fire/smoke…).
Highest
22.
SPECIFICATION
Other aircraft (C172,PA28) have explicit “Alternator Failure” procedures, but the underlying philosophy remains the same:
Structure the problem, isolate the cause, preserve energy, plan early.
OPERATIONAL
In the Tecnam P2008, no formal Alternator Failure checklist exists.
Therefore good airmanship and system understanding must substitute for written procedures.
Reduce electrical loads:
turn off non-essential
lights, avionics, and fuel
pump (if applicable).
Monitor ammeter and
voltmeter for signs of
recharge.
If no improvement →
confirm alternator failure,
preserve remaining
power.
Plan for Loss of COM /
Flapless Landing.
Recommended troubleshooting might include the following steps:
GEN/ALT switch OFF
then ON to attempt reset.
23.
T-DODAR DECISION MAKINGMODEL REVIEW
D O D
O
The situation shall be continuously reassessed.
Do not continue solely because “a decision was already made!”
A REVIEW
R
If weather conditions, aircraft status, or time margins change, perform a new DODAR evaluation and consider alternative
solutions (secondary airports, airfields, or suitable landing sites – see Field Selection criteria).
• Main Priority: Preservation of any human life.
• Secondary Priority: Aircraft recovery, if safely achievable.
FIELD SELECTION: PRIORITIES
Whenselecting a suitable field for an precautionary or emergency landing, the pilot should always look for a long, flat,
and open area, ideally rectangular in shape and oriented as close as possible into the wind. Irregular or short fields
should be avoided whenever possible, as they can limit landing distance and directional control during rollout. Colour
can also provide valuable information about the nature of the terrain:
PRIORITY
OF
TERRAIN
SELECTION
Aerodromes (Aeroporti): fdf
Qualified Airfields (Aviosuperfici): fdfd
Non Qualified Airfields (Campi Volo) fdfdf
Any other field: are typically wooded or forested zones and should only be used as a last resort.
TECHNICAL
26.
FIELD SELECTION: SHAPE& COLOUR
When selecting a suitable field for an precautionary or emergency landing, the pilot should always look for a long, flat,
and open area, ideally rectangular in shape and oriented as close as possible into the wind. Irregular or short fields
should be avoided whenever possible, as they can limit landing distance and directional control during rollout. Colour
can also provide valuable information about the nature of the terrain:
TECHNICAL
Light green fields generally indicate grass surfaces, which are soft, smooth, and ideal for an emergency
landing.
PRIORITY
OF
TERRAIN
SELECTION
Light brown areas often correspond to hard-packed earth: not perfect, but acceptable if grass fields are
not available.
Dark brown tones usually represent ploughed or uneven soil, which increases the risk of gear damage or
rollover.
Dark green areas are typically wooded or forested zones and should only be used as a last resort.
Water surfaces, though tempting when no clear land is visible, should only be considered if absolutely
necessary due to the risk of flotation problems and delayed rescue.
27.
FIELD SELECTION: WINDASSESSMENT
Understanding the wind direction and strength is essential in choosing both the landing site and the approach path.
During the enroute phase, the pilot should already have an idea of the prevailing wind direction, based on weather
information obtained before the flight. In an precautionary landing, this knowledge can be used to anticipate likely wind
behavior near the selected area.
As the aircraft descends, the pilot should look for visual indicators of
wind direction, such as smoke or dust plumes, flags, moving trees or
ripples on water surfaces. In winter, smoke from chimneys or industrial
facilities can be particularly useful for determining the direction of air
movement near the ground.
TECHNICAL
Whenever possible, the chosen field should allow for an approach and
landing into headwind, as this minimizes the required landing distance
and enhances controllability
HEADWIND
28.
In addition toform and colour visual cues, the pilot must always be alert to potential hazards within or around the
selected site. During a reconnaissance overflight, attention should be paid to powerlines, fences, roads, irrigation
ditches, buildings, people, and animals that could interfere with the approach or rollout.
EVALUATING FIELD SURFACE AND CONDITIONS OPERATIONAL
Trees or hidden obstacles near the approach path should also be carefully noted. Identifying these threats early allows the
pilot to plan a safe and obstacle-free final approach, as well as an alternative escape path should the landing need to be
discontinued.
POWERLINES
IRRIGATIONS
DITCHES
FENCES BUILDINGS
ANIMALS/
PEOPLE
• Main Priority: Preservation of any human life.
• Secondary Priority: Aircraft recovery, if safely achievable.
Begin by conductinga visual search for a
suitable landing area.
FIELD INSPECTION TECHNIQUE
FIELD INSPECTION APPROACH LANDING
Approach the centre of the selected
field at right angles to gain a clear
view of the surface and surrounding
terrain.
1
1
Observe aircraft drift to confirm wind
direction and strength.
2
Establish a left or right-hand circuit at
approximately 500ft AGL, or 100ft
below cloud base if lower.
3
2
3
Maintain a position that ensures
continuous visibility of the landing site.
While altitude allows, evaluate
the approach path,
potential overshoot area and
note terrain slope or gradient cues.
4
4
CLIMB/RE-ASSESSMENT
31.
APPROACH AND LOWCIRCUIT TECHNIQUE
FIELD INSPECTION APPROACH LANDING
Confirm Speed,
Configuration, and Engine
parameters as appropriate.
1
1
2
Assess field length by timing
over the site or by comparing
it with a known reference
(e.g., runway width, road
length).
2
Identify a clear aim point for
touchdown and
possible overshoot areas.
Ensure there is sufficient
power available for the
climb-out following the
inspection.
Low Circuit: 500ft AGL or
100ft below cloud ceiling
CLIMB/RE -SSESSMENT
32.
LANDING TECHNIQUE
FIELD INSPECTIONAPPROACH LANDING
1/3
Plan to land into the wind, touching
down within the first third of the
selected field.
Establish a short-field
approach/landing as per the Aircraft
Flight Manual (AFM/POH).
1
1
Maintain a stabilized approach path,
with full flaps and correct approach
speed.
2
2
Keep power available to adjust glide path, and remain prepared
for an immediate go-around if conditions change or hazards are
detected.
CLIMB/RE-ASSESSMENT
33.
LANDING: AIMING POINTAND TOUCHDOWN TECHNIQUE
FIELD INSPECTION APPROACH LANDING CLIMB/RE-ASSESSMENT
During final approach at constant rate of descent and airspeed, the airplane travels toward a fixed point on the
ground: this point is called the aiming point.
If the glide path is maintained without flare, the aircraft would strike the ground at the aiming point.
During the flare, some float occurs, causing the touchdown point to be beyond the aiming point.
The pilot must account for this gap, especially on short or confined strips.
FCTM Reference:
• For runways shorter than 800m, the aiming point should be anticipated (moved slightly closer) to ensure
touchdown within the first third of the landing area.
34.
If during thelow pass or approach any doubt arises about field suitability, aircraft performance, or external conditions,
a go-around must be initiated immediately.
CLIMB/RE-ASSESSMENT TECHNIQUE
FIELD INSPECTION APPROACH LANDING CLIMB/RE-ASSESSMENT
Once safely established in the climb, re-enter the circuit pattern at approximately 500ft AGL (or the previous inspection
height).
GO-
AROUND
!
35.
If during thelow pass or approach any doubt arises about field suitability, aircraft performance, or external conditions,
a go-around must be initiated immediately.
CLIMB/RE-ASSESSMENT TECHNIQUE
FIELD INSPECTION APPROACH LANDING CLIMB/RE-ASSESSMENT
Once safely established in the climb, re-enter the circuit pattern at approximately 500ft AGL (or the previous inspection
height).
During this climb and repositioning, conduct a thorough reassessment of the situation:
• Review the reason for the go-around (e.g., obstacle detected, insufficient field length, unexpected wind direction,
surface condition, or approach instability).
• Evaluate whether the original field remains suitable or if an alternative site should be selected
• Confirm that engine performance and aircraft systems remain normal.
• Consider wind changes, updated visibility or any other evolving factors that could affect the next approach.
• Once the situation has been fully evaluated and conditions are stable, re-establish normal circuit spacing and prepare
for a second inspection or final approach, following the same procedure as before.
• If any continued doubt exists about the safety of the field, do not hesitate to abandon the site and search for a more
suitable alternative while sufficient altitude and power are available.
36.
CONCLUSIONS
This scenario highlightsthat a precautionary landing is not an emergency conditions, but a planned and disciplined
decision made to prevent one.
The quality of the outcome depends less on luck and more on method, structure, and timing.
Key Takeaways:
• A stabilized and early decision ensures more options and less pressure.
• Wind, field and surface assessment must be systematic and not instinctive.
• The inspection pattern provides time to think, observe and plan.
• Go-around and reassessment are signs of good judgement, not hesitation.
• Checklist discipline and radio communication maintain structure and safety.
• The safest landing is achieved through calm, procedural thinking and not improvisation.
37.
CONCLUSIONS
The precautionary landingprocedure and its application in a scenario-based electrical failure
The emergency and abnormal contingency flow, including decision-making under time pressure
The use of the T-DODAR model for structured and logical problem-solving
The importance of checklist discipline and procedural flow during abnormal operations
The principles of field selection, including evaluation of shape, color, wind, and obstacles
The field inspection pattern, and correct approach and landing techniques
The effective radio communication discipline during
At the end of this self briefing student has reviewed:
LANDING PERFORMANCE CONSIDERATIONSOPERATIONAL
During a precautionary or short-field landing, the pilot must understand how environmental conditions, configuration,
and aircraft weight affect landing performance. Applying simple rules of thumb helps to make rapid, informed
decisions under pressure.
Wet runway: Increase landing distance by 50%.
+50%
+20% Ice on wings: Increase approach speed by 20%.
-300m
For every 1 kt above recommended threshold
speed, the touchdown point moves 300m
further down the runway.
LDR +20%
An increase in the approach speed by 10%
increases the landing distance by 20%.
LDR +21%
For every 10 knots of tailwind, increase the
landing distance by at least 21%.
Aerodynamic Drag:
In the early stages of the landing roll, aerodynamic drag provides
the most effective and “free” method of deceleration.
Unlike brakes and tires, it produces no wear and is most efficient
while airspeed is high, roughly until the aircraft slows to 60–70% of
touchdown speed. Below this, wheel braking becomes the primary
means of stopping.
Weight Effects:
Aircraft weight has a direct impact on both approach speed and
landing distance.
A 10% increase in gross weight typically leads to about a 5%
increase in landing velocity and a 10% increase in total landing
distance.
This relationship underlines the importance of accurate weight and
balance planning, especially in off-airfield or short-field operations.
TEM
40.
LOW ENERGY GOAROUND CONSIDERATIONS
Threats:
• Late go-around
recognition
(below 50ft or
during flare)
• High drag / low
thrust
combination
• Runway illusion
or poor visibility
• Distraction or
miscommunicati
on
TEM
Context:
• Occurs below approach power and often in landing configuration.
• Requires precise energy management and discipline to overcome high workload management.
• High risk of loss in flight (LOC-I), tailstrike or unstable flight path.
Errors:
• Excessive pitch-
up with possible
stall warning
and LOC-I.
• Delayed thrust
application
• Incorrect flap
sequence
• Overcontrol
during
transition
Management:
• Plan ahead: Anticipate
go-around conditions
early.
• Recognize: Do not be
afraid to call or execute
a Go-around after
correcting recognizing !
• Execute: Stabilize pitch–
power–configuration.
• Communicate: Crew
coordination essential.
• Monitor: Energy state
and flight path
continuously.
Key Considerations:
• Avoid abrupt
control inputs.
• Expect »transient
sink» before
thrust response.
• Maintain situation
al awareness:
runway, attitude,
energy profile.
AeCM Safety Cicle
LOW ENERGY GO AROUND CONSIDERATIONS OPERATIONAL
TEM
41.
SMS (Safety ManagementSystem) data at Aero Club Milano highlighted multiple
occurrences of incorrect go-around sequence.
Events reported across both student and member operations and not course-
specific.
Most deviations occurred during low-energy or «late go-around situations».
• Long interval since
last go-around
training session.
• Startle effect due to
unexpected late
decision.
• High workload and
low altitude
proximity.
• Lack of
anticipation and go-
around briefing
discipline.
Contributing Factors:
• Review the Aero Club Milano generic Go-Around
Procedure, developed jointly by the Training
Department and Safety Department, ensuring full
understanding and correct sequence application.
• Periodically revise your own FCTM to refresh:
Proper go-around discipline
Pitch–Power–Configuration technique
and communication / coordination procedures.
• Review the stable approach criteria: confirm
compliance and readiness to go around whenever
stabilization is lost.
• During flight training or recurrent checks, include
low-energy go-around scenarios to enhance
recognition and response skills.
Recommendations:
LOW ENERGY GO AROUND CONSIDERATIONS TEM
GO AROUND (GENERIC) OPERATIONAL
TEM
42.
End of Presentation
PrecautionaryLanding - Expanded Lesson Profile
Thanks for your attention!
If you wanna share your feedback about this presentation please scan the QR code: