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 Normal; 235 °C. Max.

 

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.