OM B Chapter 4 Performance

Question 1

What is the climb gradient requirement on take off with OEI ?

Answer 1

Second segment 2,4%
Final segment 1,2%

Question 2

What is the net takeoff flight path ?

Answer 2

It’s the actual flight path minus 0,8% for two engine A/C. It’s start at 35ft above the end of take off distance.
Must clear all obstacle by a vertical distance of 35ft

Question 3

What is taken into account as obstacle on the net takeoff flight path ?

Answer 3

If the track doesn’t change by more than 15° then the obstacle with a lateral distance of 600m are not taken into account.
all other, lateral distance of 900m

Question 4

when can you not follow the EOSID ?

Answer 4

once above MSA or in VMC

Question 5

When is the engine secured ?

Answer 5

• Engine flameout………Engine Master OFF.
• Damage…………………..Discharge of Agent 1.
• Fire………………………….Discharge of Agent 1 (and Agent 2 if necessary).

Question 6

What is the maximum time at takeoff thrust ?

Answer 6

10min OEI
5min all engines

Question 7

What is the standard EOSID ?

Answer 7

Climb straight head until 1000ft AAL push to level off then clean up
accelerate to green dot then OPEN Climb MCT and at 1500ft AAL then turn to HP

Question 8

What should you do if you have an eng failure below the one ENG Acceleration alt ?

Answer 8

follow the ENG out procedure

Question 9

After an eng failure and above 1500ft AAL Can you turn to nearest HP ?

Answer 9

Yes, a radius of 30NM is survey for obstacle and allow you to turn toward an holding above 1500ft

Above 1500 ft, a radius of 30 NM is surveyed for limiting obstacles. This ensures that obstacle clearance is available for engine failure in the SID routing as well as transition to the ENG FAIL HP. All SID routes are normally included in the calculation of the engine failure procedures. If the engine fails when already established on a SID, turn the nearest way to the ENG FAIL HP

Question 10

What is the first segment ?

Answer 10

First Segment - at the end of the takeoff distance at a screen height of 35’ and a speed of V2. On a wet runway, the screen height is reduced to 15’. Operating engines are at takeoff thrust, the flaps/slats are in takeoff configuration and landing gear retraction is initiated once safely airborne with positive climb. The first segment ends when the landing gear is fully retracted.

Question 11

What is the second segment ?

Answer 11

Second Segment - begins when the landing gear is fully retracted. Engines are at takeoff thrust and the flaps/slats are in the takeoff configuration. This segment ends at the higher of 400’ or specified acceleration altitude. In most cases, the second segment is the performance limiting segment of the climb.

Question 12

when is a runway considered Wet ?

Answer 12

When there is any visible dampness or water up to 3MM.

Question 13

Is the benefit of thrust reverser for takeoff perf taken into account on a dry runway ? Wet runway ?

Answer 13

Takeoff performance is calculated without the benefit of thrust reversers.
takeoff performance on a wet runway can be calculated with the benefit of thrust reversers. However, it is not allowed to take off at a weight higher than the weight on dry runway. Flexible takeoff and derated takeoff are allowed for a takeoff from a wet runway.

Question 14

What is the maximum allowed thrust reduction on a Flex takeoff ?

Answer 14

Not more than 25% of the rated thrust

Question 15

When is a flex takeoff prohibited ?

Answer 15

On a contaminated runway
dispatched with landing gear extended

Question 16

What is the max crosswind for takeoff when the runway is slippery when wet ?

Answer 16

Max 25Kt

Question 17

When is a runway considered as contaminated ?

Answer 17

when more than 25% of one third of the runway is contaminated in the relevant section with :
- a layer of contaminant
- a hard contaminant

More than 3mm of : dry snow, wet snow, standing water, slush
or a hard contaminant such as compacted snow, ice or wet ice

Question 18

What are the limitation associated with a take off on contaminated runway ?

Answer 18

Toga thrust
Captain PF
Max crosswind depend on the depth of contaminant see Quick access or FCOM limit => Operational parameters

Question 19

When is a takeoff prohibited with a contaminated runway (thickness of the contaminant) ?

Answer 19

More than 13mm of standing water
30mm wet snow
100mm dry snow

Question 20

What are the requirement for dispatch on a narrow runway ?

Answer 20

Minimum 30m
Nosewheel steering working
all brakes working

No autoland

Question 21

What is the minimum missed approach climb gradient ? what A/C config

Answer 21

2,5% based on Go around flaps
one eng inop
running eng at Toga
gear up

Question 22

What is the actual landing distance (ALD) ?

Answer 22

it’s the horizontal distance necessary to land and stop from 50ft above rwy.

Question 23

What is the required landing distance (RLD) ?

Answer 23

DRY RWY: ALD DRY × 1.67 = RLD DRY

WET RWY: ALD DRY × 1.92 = RLD WET

CONTAMINATED RWY: ALD CONTAMINATED × 1.15 = RLD CONTAMINATED

Question 24

What is the difference between inflight landing perf and landing perf dispatch ?

Answer 24

• The IN-FLIGHT LDG PERF assessment is used to determine the Factored Landing Distance (F-LD) which is used to assess actual margins on LDA. It is based on actual reported conditions at the aerodrome, including RWYCC. It also allows the flight crew to determine the most appropriate selections to be made for:

Landing Flaps configuration (CONF3 or CONF FULL)

Thrust Reversers (IDLE or MAX)

Braking Mode (Auto Brake LOW/MED or Max Manual Braking)

• The DISPATCH LDG PERF is the actual landing distance (ALD) time a factor to obtain the required landing distance (RLD).
  Actual landing distance been horizontal distance from 50ft to stop
  Required landing distance will be ALDx1,67= RLD dry, ALDx 1,92= RLD wet

Question 25

When do you use the RWYCC (global reporting format) ?

Answer 25

For in flight performance.
For takeoff and dispatch perf you should use the depth of contaminants and if required for takeoff use the Runway condition determinator

Question 26

When would you use the RCAM (runway condition assessment matrix) ?

Answer 26

With GRF concept, the RCAM is normally only used by flight crew to determine the Maximum Crosswind for Landing (Gust included).

Question 27

For performance computation what do you use to asset the rwy condition ?

Answer 27

For take off and landing dispatch you use the type of contaminant and the depth
For landing in flight you use the Global reporting format with the RWYCC.

Question 28

What is the all engine climb gradient on a SID ?

Answer 28

2.5% + 0.8% margin so 3.3%
OM B 4.4.2

Question 29

For take off performance what does the regulations requirements consist of ?

Answer 29

Rwy length
Climb gradient
Obstacle clearance
Tyre speed
Brake energy

Question 30

In case of a flex takeoff performance the actual performance ASD will be better, how can you calculate the actual ASD ?

Answer 30

The ASD calculated at the flex temp can be reduced by 3% for every 10° temp difference between flex and OAT.
OMB 4.9.1.5