Part 3
Page 5
AP101B-7200-15
Handling
Cruise
13. The aircraft will cruise at 140-145kts at 500-1000ft. A power setting
of minus 1in boost/1900RPM is sufficient to maintain 130kts. Minimum
cruising speed is 120kts. Speed increases may be made by setting
+1in or +2in boost. The maximum boost at 1900RPM is +3in. In the
event that additional speed is required the RPM must be increased to
2400. The boost will reduce as RPM is increased and vice versa. To
avoid overboosting the engine the principle of ‘rev up - throttle back’
should be observed.
14. In order to reduce vibration-induced fatigue on the airframe, the
PNF should synchronise the engine RPMs in the following manner:
a. Set 1900RPM accurately on the Number 2 engine.
b. Finely adjust Number 1 engine RPM until its blades
appear stationary when viewed through the Number 2 engine
propeller.
c. Set Number 3 engine RPM a little above 1900 (gauge
error) until the clearly-audible propeller beat is reduced to a
minimum. This will occur when the RPM indicates about
30RPM more than the Number 2 engine.
d. Adjust Number 4 engine RPM until its blades appear
stationary when viewed through the Number 3 engine
propeller.
General Flying
15. At normal loads, the aircraft is slightly unstable longitudinally in the
climb. Anything other than a small aileron input requires a corresponding
rudder input to maintain balanced flight. The aircraft has a tendency
to sit right-wing low in the cruise and requires accurate trimming, with
frequent reference to the wing tips, to ensure that the aircraft is flown
in balanced flight. The slip indicator null position is a fraction left of
centre.
UNCONTROLLED DOCUMENT - NOT FOR USE IN FLIGHT OR TO BE PRINTED
UNCONTROLLED DOCUMENT - NOT FOR USE IN FLIGHT OR TO BE PRINTED