(5)
Elevators
(6)
Vertical Fin Tips
(7)
Ends of the Leading Edge Flaps
(8)
Trailing Edge Flap Track Fairings
(9)
Landing Gear
(10)
Water Waste Masts
(11)
Pitot Probes
I. Zone 2 (Fig. 201) is where an initial entry or exit point is not usual, but where a lightning channel may be pushed back from an initial entry or exit point. As an example, the nose radome may be the area of an initial entry point, but the lightning channel may be pushed back along the fuselage aft of the radome by the forward motion of the airplane.
J. Lightning strikes can cause problems to the electrical power systems and the external light wiring. The electrical system is designed to be resistant to lightning strikes. But, a strike of unusually high intensity can possibly damage the electrical system components below:
(1)
Fuel Valves
(2)
Generators
(3)
Power Feeders
(4)
Electrical Distribution Systems
NOTE: If inaccuracies in the standby compass are reported
____ after a lightning strike then a check swing will be necessary (AMM 34-21-00/201).
K. Frequently, a lightning strike is referred to as a static discharge. This is incorrect and may cause you to think that the static dischargers found on the external surfaces of the airplane prevent lightning strikes. These static dischargers are for bleeding off static charge only; they have no lightning protection function. As the airplane flies through the air, it can pick up a static charge from the air (or dust/water particles in the air). This static charge can become large enough to bleed off the airplane on its own. If the charge does not bleed off the airplane on its own. If the charge does not bleed off on its own, it will usually result in noise on the VHF or HF radios. The static dischargers help to bleed the static charge off in a way that prevents radio noise.
L. The static dischargers are frequently hit by lightning. some personnel think static dischargers are for lightning protection. The dischargers have the capacity to carry only a few micro-Amps of currrent from the collected static energy. The approximate 200,000 Amps from a lightning strike will cause damage to the discharger or make it fully unserviceable.
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05-51-19
ALL ú ú 01 Page 203 ú Sep 28/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
TASK 05-51-19-212-001
2. Examine External Surfaces for Lightning Strike Damage_____________________________________________________
A. References
(1)
AMM 23-11-00/001, HF Communications System
(2)
AMM 23-12-00/001, VHF Communications System
(3)
AMM 23-61-01/201, Static Dischargers
(4)
AMM 28-11-00/201, Fuel Tanks
(5)
AMM 28-11-03/401, Door - Access, Wing Surge Tanks
(6)
AMM 27-11-00/501, Ailerons
(7)
AMM 27-21-00/501, Rudder
(8)
AMM 27-31-00/501, Elevators
(9)
AMM 28-41-00/501, Fuel Quantity Indicating System
(10)
AMM 34-23-00/201, Standby Magnetic Compass
(11)
AMM 34-31-00/001, ILS Navigation System
(12)
AMM 34-32-00/001, Marker Beacon System
(13)
AMM 34-33-00/001, Radio Altimeter System
(14)
AMM 34-43-00/001, Weather Radar System
(15)
AMM 34-51-00/001, VOR System
(16)
AMM 34-53-00/001, ATC System
(17)
AMM 34-55-00/001, DME System
(18)
AMM 34-57-00/001, Automatic Direction Finder (ADF)
(19)
AMM 53-12-01/201, Nose Radome
(20)
SRM 51-70-14, Allowable Damage and Repair of Flame Sprayed Aluminum Coatings
(21)
D634N301 Nondestructive Test Manual
B. Examine the Airplane External Surface
S 212-002
(1) Examine the Zone 1 (Figure 201) surface areas for signs of lightning strike damage.
(a) Do the examinations that follow: 1) Examine the external surfaces carefully to find the entrance and exit points of lightning strike. 2) Make sure to look in the areas where one surface stops and another surface starts.
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