unlocked. On aircraft modified by AFC 581, the canopy
structure also contains a flat rain seal to prevent water
intrusion into the cockpit when the aircraft is in static
Components of the canopy inflatable seal system
are the canopy inflatable seal and the canopy seal
Canopy Inflatable Seal
The canopy inflatable seal (fig. 3-3) is retained in a
channel around the circumference of the canopy
assembly frame. When inflated, the seal fills the gap
between the frame and aircraft structure.
Canopy Seal Pressure Regulator
The canopy seal pressure regulator (fig. 3-4) is on
the turtle deck. It consists mainly of a check valve,
shutoff valve, bellows, spring-loaded ball, and plunger.
TYPICAL CANOPY INFLATABLE SEAL REMOVED
The regulator regulates its 80-psi bleed air input to the
25 ± 5 psi required by the canopy seal system, and
controls inflation and deflation of the canopy inflatable
seal. The regulator also receives pressures in excess of 6
to 8 psi above regulated value.
Figure 3-3.--Canopy inflatable seal (removed).
VIEW LOOKING DOWN THROUGH ACCESS 20131-2
Figure 3-4.--Canopy seal pressure regulator location.