B. Equipment connected to pitot static systems will not be damaged by internal cabin pressure.
C. Equipment temporarily disconnected from pitot static systems, or carried as spares, may be damaged by cabin pressure greater than 16 psia.
TASK 05-51-24-202-001
2. Cabin Overpressurization Conditional Inspection
_______________________________________________
A. References
(1) AMM 35-12-00/501, Flight Crew Oxygen System
B. If cabin overpressurization more than 16 psia, but less than 21 psia, ú occurs do this step:
S 722-002
(1) Do a check of all devices with pitot static connections that were disconnected or carried as spares when the overpressurization occurred.
C. If cabin overpressurization more than 21 psia occurs do these
steps:
S 722-004
(1)
Do the above step for pressurization between 16 and 21 psia.
S 722-005
(2)
Do a check of the oxygen mask regulators from the oxygen system in the crew cabin (AMM 35-12-00/101).
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A
737-300/400/500MAINTENANCE MANUAL
LIGHTNING STRIKE CONDITION (CONDITIONAL INSPECTION) - MAINTENANCE PRACTICES
___________________________________________________________________________
1. General_______
A. The airplane configuration includes all necessary and known lightning strike protection ideas. It is an almost all metal external structure, and this type of assembly is its basic protection. The metal surface is a shield that prevents the internal compartments from lightning strikes. It also prevents entry of the electromagnetic energy into the electrical wires.
B. If the airplane has a lighting strike, make a general test of the airplane. This test will find the areas of the strike and the point of electrical discharge. After the areas have been identified, a complete test must be made to find all the damage.
C. Lightning strikes usually cause damage in two areas. The first area of damage is the location point of the lighting strike. The second area is at the point where static electricity discharge has occured. It is also possible that a heavy static electricity discharge did occur and the lightning did not hit the airplane.
D. Signs of a lightning strike or electrical discharge are usually in the Critical Strike Zone (Zone 1, Fig. 201). Damage can also be found on the skin trailing edge panels, and the skin panels along the lower aft fuselage. It is also found on the antennas, the vertical stabilizer (fin), the horizontal stabilizer, and along the wing trailing edge (Zone 2, Fig. 201).
E. In metal structures, lightning damage is usually pitting or burning of small circular holes. These holes can be grouped in one location or divided around a large area. Burned or discolored skin also shows lightning strike damage.
F. In composite (non-metal) structures, damaged solid laminate or honeycomb shows as discolored paint. It also shows as burned, punctured, or delaminated skin plies. Damage you cannot see can also be there. This damage can extend around the area you can see. Signs of arcing and burning can also occur around the attachments into the support structure.
G. Airplane components have become strongly magnetic when an airplane was hit by lightning. It is possible that during the lightning discharge, heavy electrical currents flow in the metal airframe structure. The magnetic field made by such electrical current can cause ferromagnetic materials to become magnetic.
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