Emergency Descent; Oxygen System Failure; Other Emergency - Piper PA-24-250 COMANCHE Pilot Operating Handbook

A ~ r c r a R Publlcallons
Pipcr
Cornmchc
250
(Early Model)
EMERGENCY DESCENT
1.) Oxygen System Failure:
Scction
-
3
Emergcnc).
Procedures
Time of useful consciousness in the event of oxygen system failure while operating an aircraft
at 22,000 feet is five minutes.
Seat Belt and Harness
.........................
. . . ..............
Throttle
Propeller Control ...................................................................
Full Forward
-
Increase rpm
Landing Gear ......................................................................... Down Under 150 mph
(1
30 kt)
Airspeed ....................
. . . .
.......................................... Maintain Below 150 mph (130 kt)
**
CAUTION
**
A 2,000 to 3,000 foot per minute descent is adequate to answer the emergency with minimal
risk of damage to the engine, and discomfort to the passengers.
Consider elevation of terrain on descent. Initiate recovery procedure at 10,000 feet MSL or
2,000 feet AGL as appropriate.
Landing Gear ............................................................................................................. Retract
Mixture ....................
. .
..............................................................................................
Enrich
Throttle
........................................................................................................ Increase Slowly
Propeller Control
.............................. ..........
................................................... Cruise Setting
Adjust altitude and power setting as appropriate and continue flight to destination airport.
2.)
Other Emergency:
In the event of an emergency where thermal shock to the engine and passenger discomfort are
overridden by other factors (such as a fire that cannot be extinguished) which requires getting
the airplane on the ground as quickly as possible, the additional action of rolling the aircraft to
a 40 to 45 degree bank and descending in a spiral destroys a large portion of lift and increases
rate of descent substantially.
Copyright:
1993
Page 3-9
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