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AP101B-7200-15
Hydraulic System
HYDRAULIC SYSTEM MANAGEMENT
Pre-Flight Inspection
11. The aircraft, in particular the areas surrounding the hydraulic reservoir,
undercarriage, bomb door and flap jacks are to be inspected for leaks.
The undercarriage emergency air shuttle valves at the rear of the
undercarriage bays are prone to slight seepage. Check the hydraulic
accumulator air pressure is 220PSI and the emergency air pressure is
1200PSI. Ensure the undercarriage lever is DOWN and bolted, the bomb
door lever selected OPEN and the bomb door light illuminated. The flap
lever must be in the NEUTRAL detent. Switch ON the undercarriage
and flap indicators and ensure that the undercarriage indicator shows
two greens and is serviceable and that the flap position indicator agrees
with the actual flap position (usually about 10º).
Pre-Start Checks
12. The flap lever is again checked to ensure it is in the neutral position.
Starting Checks
13. When No. 3 engine is started the bomb doors are closed, proving
the serviceability of the hydraulic system when it is powered by No. 3
engine EDP.
After Start Checks
14. The flap operation is checked over the entire range by moving the
flap selector fully DOWN then fully UP ensuring all movement is indicated
correctly and without hesitation. The flaps are left at UP with the selector
at NEUTRAL.
Pre-Take-Off Checks
15. The flaps are set to 20º prior to take-off and the flap selector set to
NEUTRAL.
UNCONTROLLED DOCUMENT - NOT FOR USE IN FLIGHT OR TO BE PRINTED
UNCONTROLLED DOCUMENT - NOT FOR USE IN FLIGHT OR TO BE PRINTED