En-Route Limitations Flashcards
what should be done for engine failure in flight
- control the aircraft
- set green dot speed
- MCT on live engines
- fly for minimum drag
what’s the descent profile like for engine failure in flight
- can take 35-45 minutes
- shallows out as altitude decreases as more thrust is available at lower ALT due to density
what should be done for depressurization in flight
- Vmo/Mmo
- Max drag/spd brake
- throttle idle
What is the gross drift down flight path, how is it determined
- flight path actually flown by the aircraft after engine failure
must be determined with:
- most unfavorable CoG
- Critical engine inop
what is the net drift down flight path, how is it determined
- the gross drift down flight path minus a reduction
for 1 engine inop
- 1.1% (2 engine a/c)
- 1.6% (4 engine a/c)
for 2 engine inop
- 0.5% (4 engine a/c)
what are the en route obstacle clearances laterally with 1 engine inoperative
- 5 or 10nm (JAA)
- 5sm (FAA)
what are the vertical clearance requirements
- net flight path gradient must be +ve at least 1000ft above all terrain and obstructions
If that can’t be met:
- net flight path must permit a/c to continue from cruising alt to an a/d for landing clearing all terrain and obstacles by 2000ft.
Must be the option to:
- turn back
- divert
- continue
what are the diversion airfield net flight path requirements
- must have +ve gradient 1500ft above a/d where landing is assumed to be made after an engine failure
What is the oxygen system limitation
following a depressurization, cabin alt is treated the same as a/c altitude
What is the performance limitation
- performance profile must stay below the oxygen profile
- assumes a/c is able to fly at Vmo
what are the obstacle clearance requirements following a cabin pressurisation failure
- net flight path is not required
- any altitude below inital flight altitude can be flown without issue as long as all engines are running
- descent profile must clear any obstacle by 2000ft.
