Part 4
Page 6
Landing Gear Failure
18. The landing gear is only to be selected up or down when the aircraft
wings are level in order to prevent excessive torsional loads being
induced on the landing gear assemblies.
19. Undercarriage selection is ordered by the aircraft Captain after
speed has been checked below 150kts. The Flight Engineer is to cross
check the speed then select landing gear UP or DOWN accordingly.
Starboard gear travel is monitored by the Flight Engineer while the
Navigator monitors port gear travel. This procedure enables early
detection of any undercarriage issue. Scrutiny of the hydraulic system
pressure gauge will assist fault diagnosis.
20. If the ACOV malfunctions or the hydraulic system fluid is below
usable level, the
Emergency Air System
can be used to operate the
undercarriage and flaps.
Emergency Air System
21. In the event of hydraulic system failure the
Emergency Air System
is used to lower the undercarriage and flaps in the sequence itemised in
the FRCs Card 10 Reverse. Operation of the
Emergency Air System
is by forward movement of the selector valve on the front edge of the
Flight Engineer’s panel.
PNEUMATIC SYSTEM MALFUNCTIONS
22. The pneumatic system is serviced by a reservoir charged by air and
nitrogen which, in turn, is charged by 3 engine camshaft-driven Heywood
Compressors fitted to Numbers 2, 3 and 4 engines. Supply pressure
is indicated on a triple pressure gauge on the Co-Pilot’s panel. System
pressure must be above 250PSI prior to the Flight Engineer’s pre-flight
checks and 200PSI minimum prior to start. The pneumatic system
provides pressure for operation of the wheel brakes, radiator shutter
rams and the supercharger rams.
UNCONTROLLED DOCUMENT - NOT FOR USE IN FLIGHT OR TO BE PRINTED
UNCONTROLLED DOCUMENT - NOT FOR USE IN FLIGHT OR TO BE PRINTED
