OM-B and OM-A Flight Planning Flashcards
How much fuel does the APU consume? (per minute)
2kg
How much fuel is consumed with running engines / single engine during taxi? (per minute)
10 / 7 kg
How much fuel is consumed in the holding (1500ft) ? (per minute)
40kg
What is the additional fuel consumption for engine anti ice during CLB, CRZ and HOLD? (per minute)
1,1kg / 1,0kg / 2,0kg
What is the additional fuel consumption for engine anti ice and wing anti ice during CLB, CRZ and HOLD? (per minute)
2,0kg / 2,0kg / 3,0kg
What is the penalty of carriage of uneconomical fuel per hour? (in %)
3-4%
Adequate alternates have to be available along the route. How far may they be away from the route? (in minutes) What are the conditions (aircraft, environmental)
60 minutes flight time
OEI cruise speed
ISA
still air
Adequate alternates have to be available along the route. How far may they be away from the route? (in NM for A319, 320 and 321)
A319: 380NM
A320: 400NM
A321: 400NM
What are the conditions for takeoff alternate planning? (aircraft, environmental) What is the maximum distance?
OEI
still air
ISA
overweight considered
max 320NM
The OFP fuel planning shows taxi fuel. Is it calculated for taxi out only? Or for taxi out and taxi in?
Taxi out only
The OFP fuel planning shows taxi fuel. Is it calculated for the planned takeoff runway? How is it calculated?
It’s not planned for a specific runway.
It’s based on historical data.
The OFP fuel planning shows taxi fuel. May flightcrew reduce taxi fuel?
Yes, taxifuel may be reduced at pilot’s discretion.
The OFP fuel planning shows trip fuel. Can you reduce it for an expected reduction in trip distance? How?
Yes, it can be reduced. 4kg per 1NM less.
The OFP fuel planning shows trip fuel. Can you increase it for an expected increase in trip distance? How?
Yes, it can be increased. 5kg per 1NM more.
May contingency fuel be used already on the ground?
Yes, it can be used after pushback / engine start.
How is contingency calculated (with statistical data avail)?
It is the greater of CONT95 / CONT99 or
5 minutes of holding time at 1500ft overhead destination in ISA conditions
How is contingency calculated (no statistical data avail)?
It is the greater of 5% of the trip fuel or
5 minutes of holding time at 1500ft overhead destination in ISA conditions
How is reduced contingency calculated (statistical data avail)?
- It is the greater of CONT90 or
- 5 minutes of holding time at 1500ft overhead destination in ISA conditions or
- 190 (A319), 204 (A320ceo), 170(A320neu), 200(A321neo)
How is reduced contingency calculated (no statistical data avail)? What is required to reduce contingency?
- It is the greater of 3% trip fuel or
- 5 minutes of holding time at 1500ft overhead destination in ISA conditions or
- 190 (A319), 204 (A320ceo), 170(A320neu), 200(A321neo)
- An enroute alternate is required
What is covered by alternate fuel?
- a missed approach at destination
- CLB CRZ and DES to alternate
- approach at alternate
If two alternates are planned? What is the fuel figure shown on the OFP?
It’s the fuel to the alternate which is requires more.
How is final reserve fuel defined? What if no alternate is planned?
30 minutes holding over destination alternate
in 1500ft
ISA conditions
at the estimated weight
If no alternate is planned, the hold is calculated over destination.
What is additional fuel used for? How is it calculated?
- It is used when no alternate is planned.
In this case it’s 50% of the reserve fuel. (15 minutes hold) - It is used for special considerations for engine out or loss of pressure at a critical point
When should extra fuel be considered? Name some examples!
Only if the strong possibility exists that it will be used.
- TS forecast
- WX at minimums at destination
- freezing FG/RA/DZ
- snowfall
- ATC delays
- icing enroute
What is the penalty of extra fuel carried? (in % per hour)
3% per hour
What time frame is considered for the weather forecast suitability check of destination and alternate?
± 1 hour of ETA at that aerodrome
What weather information is used for planning of the departure airport suitability?
Actual weather
May CMV/RVR conversion be used at planning stage?
No.
When is a takeoff alternate required? Which limitations must be considered?
When aircraft performance or weather preclude a return to destination.
- OEI and MEL related limitations must be considered.
When are two alternates required?
- If the WX forecast is below minimum for the expected approach at destination
- if no WX data is available
- if landing performance is not assured due to specific wind component / runway state
For destination and enroute alternate planning, what approach minima can be used?
Approach minima one category lower than what is available.
For CAT 2+3 / OTS CAT2 / LTS CAT1 = CAT 1 RVR
For CAT 1 = NPA RVR/VIS and ceiling > MDH
For APV = NPA minima
For NPA = NPA RVR/VIS + 1000 and ceiling > MDH + 200
For circling = circling
During planning phase (suitability check) a TAF indicates “FM” or “BECMG AT”. When are weather minima applicable? How is wind considered?
Applicable at start of FM / BECMG AT for both improving and deteriorating conditions.
Mean wind must be within minima. Gusts may be disregarded.
During planning phase (suitability check) a TAF indicates “BECMG”, “BECMG FM”, “BECMG TL” or “BECMG FM TL”. The conditions are deteriorating. When are weather minima applicable? How is wind considered?
Deteriorating conditions are considered at the start of time / time frame.
Mean wind must be within minima. Gusts may be disregarded.
During planning phase (suitability check) a TAF indicates “BECMG”, “BECMG FM”, “BECMG TL” or “BECMG FM TL”. The conditions are improving. When are weather minima applicable? How is wind considered?
Improving conditions are considered at the end of time / time frame.
Mean wind must be within minima. Gusts may be disregarded.
During planning phase (suitability check) a TAF indicates “TEMPO”, “TEMPO FM”, “TEMPO TL” or “TEMPO FM TL”. The conditions are deteriorating with SHRA and TS. When are weather minima applicable? How is wind considered?
Weather is not applicable. Wind and gusts may be disregarded, because this is a short lived condition.
During planning phase (suitability check) a TAF indicates “TEMPO”, “TEMPO FM”, “TEMPO TL” or “TEMPO FM TL”. The conditions are deteriorating with FOG. When are weather minima applicable? How is wind considered?
Weather is applicable, as it is persistent.
Mean wind must be within minima. Gusts may be disregarded.
During planning phase (suitability check) a TAF indicates “TEMPO”, “TEMPO FM”, “TEMPO TL” or “TEMPO FM TL”. The conditions are improving. When are weather minima applicable? How is wind considered?
It should be disregarded.
During planning phase (suitability check) a TAF indicates “PROB TEMPO”. When are weather minima applicable? How is wind considered?
Deterioration may be disregarded.
Improvement should be disregarded including mean wind and gusts.
