TWIN COMANCHE C/R
c.
EMERGENCY PROCEDURES
1.
DETECTING A DEAD ENGINE
a.
Loss of Thrust
b.
Nose of aircraft will yaw in direction of dead engine (with coordinated controls)
1
-,
FEATHERING PROCEDURE
The propellers can be feathered only while the engine is rotating above 1000 RPM. LOSS of
centrifugal force due to slowing RPM will actuate a stop pin that keeps the propeller from
:
feathering each time the engine is stopped on the ground. If an engine freezes up. it will be
impossible to feather its propeller. Single engine performance will decrease if the propeller of the
inoperative engine is not feathered.
I
it-.
C.
d.
e.
f.
g.
h.
i.
j.
k.
1.
m.
n.
0.
P.
q.
r.
S.
t.
U.
Minimum Control Speed - 80 MPH
Best R/C Speed Single Engine - 105 MPH
Maintain Direction and Airspeed above 90 MPH
Mixture Controls - forward
Propeller Controls - forward
Throttle Controls - forward
Gear - retract
Wing flaps - retracted (check visually)
Electric Fuel Pumps - “ON”
Magnetos - “ON”
Identify inoperative engine
Throttle of inoperative engine - retard to verify
Propeller on inoperative engine - feather
Mixture on inoperative engine - idle cut off
Electric Fuel Pump of inoperative engine - “OFF”
Magnetos of inoperative engine - off
Cowl Flaps - close on inoperative engine, use as required on operative engine
Alternator circuit breaker switch of inoperative engine - off
Electrical Load - reduce to prevent battery depletion
Trim - as required
Fuel Management - fuel “OFF” of inoperative engine, consider crossfeed use
3.
UNFEATHERING PROCEDURE
iti-.
Fuel valve on inoperative engine side - “ON”
Electric fuel pump - “OFF”
Throttle - open l/4 inch
I.
i. Propeller control - forward .
i
I
e. Mixture - rich
f. Magneto switches - “ON”
!
g-
Starter - engage till prop windmills
h. Propeller - set to cruise RPM
i.
Throttle - reduced power till engine is warm
j.
Alternator circuit breaker switch - “ON”
FAA APPROVED November 28,1969
REISSUED: June 1,197O
REVISED: November 30,197l
REPORT: 1605 PART I PAGE 13
MODEL: PA-39
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