TWIN COMANCHE C/R
conditions of flight. It is recommended that cylinder head temperature not exceed-400” F and the oil
temperature should not exceed 245” F.
Turn off the electric fuel pumps after starting to make sure that the engine driven pumps are
operating. The electric fuel pump should be on during take-off, landing and when changing fuel selector
positions to prevent loss of power at critcial times.
ELECTRICAL POWER
Do not attempt flight with a very low charged battery. If the battery charge is too low, the alternator
voltage control may become erratic.
CAUTION
Be sure to have the alternator circuit breaker switches turned on.
If the battery charge is low and alternators are not operating, an
inadvertent gear-up landing is possible because the warning horn
and flashing light will not operate and the landing gear cannot be
extended electrically. Manual extension of the landing gear is
required under these circumstances.
TAXIING AND PRE-TAKE-OFF
Start to move the airplane forward. During initial taxiing, throttle back and apply brakes to check
their operation. Use differential power and nose wheel steering rather than brakes when taxiing. Retard the
throttle to the engine on the inside of turn and advance the throttle to the engine on the outside of the
turn.
The autopilot should be off before take-off.
On a cold day test defroster and cabin heater before takeoff. Do not fly in cold weather when the
heater is inoperative, as the windshield may become frosted.
Lock the door before take-off. If this item is neglected and the door comes open after- take-off,
maintain normal climb and airspeed until sufficient terrain clearance is obtained. (Do not risk loss of
control of the airplane to close the door. It is possible to continue safely for extended periods with the
door unlatched.) When it is impossible to land straight ahead, the door may sometimes be closed by the
following procedure: slow the airplane to 100 miles per hour; lower landing gear and wing flaps; open, the
small window to the left of the pilot; pull the door shut and lock it.
Check list: 3. Engine gauges - check green.
1. Parking brake - on.
4. Lights - as required.
2. Engine run-up
Mixture controls - forward:
5. Pitot heat - as required.
(a)
6. Transponder.&z&@? Mw 6
(b) Propeller controls - forward.
7. Wing flaps - set (check visually).
(c) Throttle controls - forward (1500 rpm).
8. Trim tabs - set.
(d) Propeller controls - exercise.
9. Gyro pressure - 4.8 to 5.1 in. Hg.
(Check feather; 500 rpm maximum decrease.)
10. Directional Gyro - set.
(e) T-mottle controls - forward (2200 rpm).
11. Turn and Bank - operating.
(f) Magnetos - check.
12. Altimeter - set.
13. Clock - wind and set.
Normal drop - 100 r-pm
Maximum drop - 175 rpm
14. Alternator output - check.
15. Electric fuel pumps - on.
Differential drop left to right - 50 rpm
16. Turbochargers - set or off.
17. Door - locked.
The normally recommended setting for sea level take-off is full throttle at 2700 RPM. The slightly rich
mixture for this setting aids in cooling the engine.
b.
PAGE 4
OPERATING INSTRUCTIONS
REVISED: March 21,1975
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