OM-B Performance

Question 1

What are the OEI minimum required climb gradients for each segment in the takeoff flight path?

Answer 1

Second segment 2.4 percent and final segment 1.2 percent.

Question 2

When is a SID climb gradient specified in LIDO SID text description?

Answer 2

When exceeding 3.3 percent (2.5+0.8 net margin)

Question 3

Where does the net takeoff flight path begin for obstacle clearance?

Answer 3

35ft above end of takeoff distance

Question 4

What is the standard engine failure procedure?

Answer 4

Runway hdg, turn to holding point at 1500’
- climb runway track
- maintain V2, or IAS at time of fail (max v2+20)
- eng secure & above 800’ AAL: push level off, accelerate and clean up
- reaching green dot and above 1500’ AAL, turn to holding point

Question 5

What is a dry runway?

Answer 5

When the surface is free of visible moisture and not contaminated within the area of inteded to be used

Question 6

What is a wet runway?

Answer 6

A runway covered by any visible dampness or water up to 3 mm within the area inteded to be used.

Question 7

When ‘slippery when wet’ what are the considerations?

Answer 7

Maximum crosswind is 25 kts, slippery wet is selected in the runway condition. Flex takeoff is allowed

Question 8

When is a runway contaminated?

Answer 8

25 percent of 1/3 of the runway is covered with a layer of fluid not considered thin or hard (>3 mm)

Question 9

Is a flex takeoff not permitted?

Answer 9

Contaminted runway, dispatch with gear down.

Question 10

What are the pro’s of using flex rated thrust?

Answer 10

Improves engine reliability, aircraft dispatch reliability and reduces engine operating cost

Question 11

What is the maximum percentage of derating during a flex take off?

Answer 11

25 percent of the rated thrust

Question 12

Why can you say flex thrust is conservative?

Answer 12

The actual OAT is a lot lower than the one you put in the box, so the air density is higher (=more thrust than calculated is given)

Question 13

What to do when the cleared runway is less than 45 meters wide?

Answer 13

If within operational limits, use the contaminant given and compare the results, take more limiting. If the snowbanks are there and are outside operational limits: it is not safe to roll and break through them; consider unusable: apply narrow runway rules.

Question 14

When is a runway narrow? Minimum runway width? Any considerations?

Answer 14

Less than 45 m, minimum 30 m, CM1 is PF unless CM2 is trained. No autoland.

Question 15

What to checkif a runway width <40 meters by nowtam or snowtam?

Answer 15

Check Vmcg against FCOM limits to ensure V1 is above Vmcg.

Question 16

How much wind does the EFB take into account?

Answer 16

150 percent tailwind, 50 percent of headwind component.

Question 17

What is the minimum go around all engine climb gradient?

Answer 17

2.5 percent unless something else is specified. This is at 1500’, N-1, G/A flaps, gear up and TOGA selected.

Question 18

How to increase the climb gradient on takeoff

Answer 18

Thrust reduction/acceleration altitude increase, climb speed limit, final climb speed increase.

Question 19

What is the difference between in flight and dispatch landing performance calculations?

Answer 19

Dispatch: computes max LW on anticipated weather and runway in use. Can improve by selecting autothrust off and uses max manual braking.
In flight: computes max LW on actual weather and runway in use.

Question 20

When could you be limited on the go around climb gradient?

Answer 20

With N-1

Question 21

What to do when you are limited on the go around climb gradient?

Answer 21

Select higher minima, land flap 3, follow the EOSID

Question 22

What is our landing flaps policy?

Answer 22

> 10 knots tail flap full

Question 23

What to do when manual brake selection needed?

Answer 23

Select medium, full reverse, at nosewheel touchdown override manually full.

Question 24

When do we select idle/full reverse?

Answer 24

Always idle if no faults prohibiting, full on contaminated runway, emergency or performance needed.

Question 25

For dispatch computation, what reverse credit do we take?

Answer 25

For dry and wet runway: inop (through MEL). Contaminated: operative.

Question 26

For in flight computation, what reverse credit do we take and what runway condition do we select?

Answer 26

For dry: off.
For wet: select condition 2, reverse off. If ok: no reverse needed (so idle okay). If not: full reverse needed.
For <5: use thrust reverse credit

Question 27

Dispatch landing performance, what is the maximum LW? What if it can’t be satisfied?

Answer 27

The lower of the max LW on the most favourable runway or the runway to be expected. If it can’t be satisfied two alternates have to be selected.

Question 28

What is the RLD?

Answer 28

Dry: ALD dry x 1.67
Wet: ALD dry x 1.92
Contaminated: ALD contaminated x 1.15

Question 29

What are the considerations flying to places with a high magnetic variation?

Answer 29

METAR & TAFs are done in degrees to actual north, whilst ATC/D-ATIS with magnetic north

Question 30

APU fuel burn?

Answer 30

2 kg/min

Question 31

Taxi fuel?

Answer 31

10 kg/min or 7 kg/min on one engine

Question 32

hold at 1500’ fuel?

Answer 32

40 kg/min

Question 33

Approach fuel?

Answer 33

17 kg/min

Question 34

Engine anti ice in climb? E +WAI?

Answer 34

1.1 kg/min and 2.0 kg/min

Question 35

E and E + WAI in crz?

Answer 35

1.0 kg/min and 2.0 kg/min

Question 36

E and E+WAI in hold?

Answer 36

2.0 kg/min and 3.0 kg/min

Question 37

What is the fuel penalty for carrying extra fuel?

Answer 37

3-4 percent

Question 38

What to consider when looking at max shearrate on the first page of the OFP?

Answer 38

Only the waypoints listed on the route are taken into account: go through the pages to see if there is a higher one.

Question 39

Bag loading?

Answer 39

A319: 150 rear, max 50 hold 5, maximise hold 4, overspill in 1.
A320: 85 bags hold 1, then 4, then 3, non-normal in 5.
A321: 100 bags in 3, 50 in 4, then 2. Elec wch in 4 if less than 100 bags, 2 if more. Non-normal in 5.

Question 40

What plane has a ground stability issue?

Answer 40

320 issue. Front hold should be loaded ahead or at the same time as the rear hold. When disembarking via front only, be careful and stop flow to establish pax in the front if needed.

Question 41

Figures and limits for LMC?

Answer 41

84 kg pax
11 kg cabin bag
15/13/11 kg rush bag
New LMC +10/-20 pax
Limits +250 kg and +/-2% MAC

Question 42

Zones?

Answer 42

A319 A320
A 1 – 9 1 – 10
B 10 – 18 11 – 20
C 19 – 26 21 – 31

321:
1-13, 14-28, 29-40