737-300/400/500MAINTENANCE MANUAL
SEE B SEE A
SEE A
SEE B
SEE A
SEE B
SEE A
SEE B
SEE A
SEE B
ZONE 1: HIGH PROBABILITY
ZONE 2: PROBABLE
STATIC DISCHARGER
(EXAMPLE)
ZONE 3: LESS PROBABILITY
SET SCREW SET SCREW
RETAINER
RETAINER STATIC
DISCHARGER
(EXAMPLE)
TRAILING EDGE SURFACE STABILIZER AND FIN CAP
INSTALLATION (EXAMPLE) INSTALLATION (EXAMPLE)
A B
External Lightning Strike Areas
Figure 201
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737-300/400/500MAINTENANCE MANUAL
H. The external surface areas are where the lightning usually hits first. The surface components that it hits are the nose radome, engine nacelles, wing tips, stabilizer tips, elevators, and the vertical fin tips. Other areas are the ends of the leading edge slats, trailing edge flap track fairings, and the external lights. Also hit often are body extensions such as the landing gear, waste water masts, and the pitot probes.
I. The surface where lightning usually hits and then moves aft from the point of the hit is the fuselage. It also moves from the wing surfaces aft from the ends of the leading edge slats.
J. Lightning strikes can cause problems to the electrical power systems and the external light wire bundle. The electrical system is made to be resistant to lightning strikes and can get a lightning strike without damage. But an unusually intense hit can damage the electrical system components.
K. A lightning strike is often called a static discharge. This causes problems when you refer to the static dischargers (small rod devices) found on the external surface of the airplane. These devices do not prevent the lightning strikes on the airplane. The primary function of the static dischargers is to bleed off the static charge on the airplane. This is to prevent radio interference in the airplane avionics receivers (examples are: VHF Comm, ADF, and VOR).
L. The electric current level that goes through the dischargers is very small (measured in microamperes) compared to lightning strike current (measured in thousands of amperes). The static dischargers are frequently hit by lightning. Some of them are installed at a specific point to prevent damage to a light or to another system component. This is an added function above their usual function to discharge P Static energy.
TASK 05-51-27-212-001
2. Examine for Lightning Strike Damage___________________________________
A. References
(1)
AMM 23-61-00/601, Static Dischargers
(2)
AMM 27-11-00/501, Ailerons
(3)
AMM 27-21-11/601, Rudder
(4)
AMM 27-31-00/501, Elevators
(5)
AMM 28-40-00/001, Fuel Quanity Indicating System
(6)
AMM 34-24-00/201, Magnetic Standby Compass
B. Examine the Airplane External Surface
S 212-002
(1) Do the tests that follow:
(a) Examine the Zone 1 (Fig. 201) surface for signs of a lightning strike. 1) Examine the internal and external surfaces of the nose
radome. a) Look at the honeycomb sandwich structure for burns, punctures, and pin holes.
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2) Examine the metal structure for holes or pits and also look for burned or unusually colored skin or rivets.
3) Examine the external surfaces of the composite honeycomb sandwich components; look for discolored paint and burned, punctured, or delaminated skin plies.
S 342-003
CAUTION:_______MAKE SURE TO SEAL OR REPAIR ALL DAMAGE. FAILURE TO SEAL OR REPAIR DAMAGE CAN CAUSE MORE INTERNAL DAMAGE BECAUSE MOISTURE CAN GET IN.
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