Armstrong Whitworth HP52
‘Hampden’ Mk1
These
are just for guidance. [ NB: based on the AP. ]
STARTING set:-
Main
Tank cocks open.
Hydraulic
Power Bolt to OFF, Selector to Gear Down position and Bomb-door wheel to
closed.
Flight /
Ground switch to ‘Flight’.
Undercarriage
indicator switch on. Test warning horn.
Throttle
slightly open. Mixture rich.
Propellers
to low speed. Cowling Gills open and Carburettor heat to cold.
All
Magnetos on and Start engine.
Run as
slowly as possible for 30 secs.
Starter
Magnetos off and propellers to high RPM.
Test the
Hydraulic system by lowering and raising the flaps.
Check
Brake pressure is 120 Pounds (lb.) per square inch.(psi.) min. [450 lb.
supply].
Then
warm up at 1,000 Revolutions Per Minute (RPM).
Check oil pressure rises.
Check
120 °C. Cylinder Head Temperature (CHT); 15 °C. Oil Temperature.
Check
full engine speed of 2600 RPM. At 6¾ lb. Boost.[43.6 inches of Mercury (” Hg.)]
Reduce
to +6 lb.[42” Hg.] of boost and check ‘magneto drop’ of less than 50 RPM.
At 0 lb.
Boost, check the operation of the constant speed airscrews.
At full
throttle check oil pressure.
NB:
Minimum
RPM. for normal running is 1,000 RPM.
Oil
Pressure is 80 psi. normal ~ 65 lb. Min.
CHT is
190 ºC ~ 210 ºC
TAXYING:-
Switch
on Pressure Head heater.
Keep
engine RPM. above 1,000.
Taxi
SLOWLY to avoid tail wheel wobble.
TAKEOFF:-
Auto-pilot
off. Gills closed. Hydraulic Power Bolt ON.
Run up to
1,000 RPM. release brakes and increase to full throttle.
Set 6¾ lb. / 2,600 RPM. to 500 ft.
Minimum
Take Off speed is 85 mph.
Safety
speed is 110 mph.
CLIMB:-
Select
Gear up, and hold down to level flight until 120 mph. is reached.
Check
gear lamp shows red; restore Power Bolt and then Selector to neutral.
Set + 2½ lb. / 2,250 RPM.
Climb at
125 mph. to 15,000 ft.
CRUISE:-
At 125 ~
150 mph. ~1,800 RPM. -1 lb. [27.8” Hg.] boost.
APPROACH:-
At ~120
mph. 1,800 RPM. -2 lb. [ 26” Hg]
Set the
Selector to ‘Gear Down’, Power Bolt ON, Mixture to Rich [‘Normal’].
Before Landing:-
Check
Brake pressure [ 100 psi.+ ], Gills closed and Auto-Pilot off.
FINALS:-
100 mph.
and 2,600 RPM. And 18º of flap.
Flaps
fully down when sure of reaching runway.
FLARE:-
80 ~ 75 mph.
then Minimum RPM.
[DO NOT
get too slow here!]
AFTER LANDING:-
Wait
until speed has reduced to 40 mph. before braking.
When the
aircraft has stopped, then raise flaps and set the Power Bolt to OFF.
Open the
cowl Gills.
Taxi as
needed.
Run
engine at 800 ~900 RPM. for about a minute to empty the sumps
Stop
engine at minimum throttle using Fuel Cocks, which incorporate slow-run
cut-outs.
Switch
off the Magnetos and Indicator lamp switches.
Turn off
all electrics.