PART 1 - DESCRIPTIVE
36. Hood jettisoning
(a) The hood is jettisoned by gas pressure from a jettison
gun acting on two pistons which release the hood rails
and then push the hood upwards. This is initiated by
pulling the handle (34) on the port shelf. This action also
operates a micro-switch which, if electrical power is
available, automatically lowers the gunsight.
(b) An external emergency release ring is inside a break
panel on the port side of the fuselage below the cockpit.
When the release ring is pulled the jettison gun is not
fired but the hood rails are released. The hood may then
be lifted clear manually.
(c) The hood is also jettisoned automatically whenever either
the ejection seat blind handle or the seat-pan alternative
firing handle is pulled (see para. 40(a)(iv)). In this case
the G.G.S. is not automatically lowered
35. Cockpit pressurization, heating and demisting
NOTE.-The system is inoperative whenever the hood is
(a) Hot air under pressure is bled from the engine compressor
to supply the heating, pressurization and demisting
system. The air supply to the cockpit terminates in spray
pipes which provide for windscreen, side panels and hood
(b) The master ON/OFF switch (3) controls the flow to the
cockpit. The temperature control lever (2) permits the
selection of AUTO or manual HOTTER-COLDER. The
TEMP. SELECTOR (1) is for use in AUTO to preselect
the desired temperature, which is then maintained by a
thermostat. In the manual range, temperature is con-
trolled by first setting the lever to HOTTER or COLDER
and then, when the desired temperature is reached
engaging the lever in the central gate.
(c) The cockpit altimeter (74) should indicate in accordance
with the following table. Should the cockpit pressure
differential drop by more then ½ lb./sq.in a red light
(73) on the right of the instrument panel comes on.