Figure 2-6.Hydraulic canopy operation.
floor. This selector valve may be operated either
electrically or manually from the cockpit or the
nosewheel well. Normal operation is electrical
through the canopy switch on the pilots instru-
ment panel. This switch controls the selector valve
whenever the engines are operating or whenever
external electrical and hydraulic power is applied
to the aircraft. Manual opening of the canopy is
conducted using a hand pump system that pumps
the canopy into position when combined hydraulic
system power is not available on the aircraft.
The hand pump is in the nosewheel well and can
be operated either from there or from the
When the selector valve closes, hydraulic
pressure from either the combined hydraulic
system or the hand pump system flows through
the selector valve into the canopy close line.
Pressure in this line is delivered through a flow
regulator to the rod end of the canopy actuating
cylinder, causing the piston and rod to retract and
close the canopy. Opening of the canopy is the
reverse of the closing operation.
NOTE: Maintenance of the hydraulic portion
of the A-6 canopy actuation system is the
responsibility of the AMH rating.
The A-6 canopy jettisoning system is not
actuated as part of the seat ejection sequence, but
must be manually selected separately from the
ejection process. Canopy jettison is a separate
function because the normal procedures for