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pressure (vacuum pressure) damage to the airplane structure.
This can prevent structure damage during a rapid descent.
Location
The negative pressure relief valve is on the lower aft fuselage,
on the left side, near the aft service door.
Access to the valve is from the aft cargo compartment.
General Description
The negative pressure relief valve is a mechanical device and
operates independently. It does not interface with other airplane
pressurization systems and requires no crew action.
The negative pressure relief valve is a flapper type valve. The
valve hinges on its top edge and opens inward. A spring on its
hinge pin holds the valve closed.
Negative differential cabin-to-ambient pressure opens the
valve. The valve opens when pressure outside of the airplane
is 1.0 psi more than the pressure inside of the airplane (-
1.0psid).
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Purpose
The cargo compartment blowout panels prevent damage to the
airplane structure during sudden decompression.
Physical Description
The ceiling blowout panel has these parts:
* Blowout panel
* Frame
* Cap strip.
The bulkhead blowout panel has these parts:
* Blowout panel
* Frame
* Cap strip
* Grate.
Location
The cargo compartment blowout panels are in these places:
* Cargo compartment ceilings
* Cargo compartment bulkheads.
Functional Description
During rapid decompression, differential pressure pushes the
panels out of their frames. When the panels push out of their
frames, the pressures in the upper and lower fuselage lobes
equalize quickly. This equalization of pressure prevents
damage to the airplane structure.
A differential pressure of 1.0 psid will push the blowout panel
out of the frame.
The blowout panels on the cargo compartment bulkheads have
grates. The grates do not let baggage hit the blowout panels.
Training Information Point
If the aft cargo door does not open from the outside, you can use
the aft ceiling blowout panel to get access from the passenger
compartment. If the forward cargo door does not open from the
outside, you can use an access panel to get access from the
passenger compartment.
See the equipment and furnishings chapter for more
information on the forward cargo compartment access panel
(SECTION 25-50).
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Purpose
The pressure equalization valves allow air to flow into or out of
the cargo compartments to keep the cargo compartment
pressure the same as cabin pressure.
Physical Description
The cargo compartment pressure equalization valve has two
　
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