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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
STATIC GROUNDING - MAINTENANCE PRACTICES
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1. General
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A. This procedure contains these tasks:
(1)
Static Ground procedure
(2)
Bonding procedure
(3)
Measure Airplane Electrical Resistance to Ground
B. Grounding (Static Grounding) is the process of connecting one or more metal objects and ground conductors to ground electrodes (an electrical path to earth).
(1) A positive ground is the same as a static ground.
C. Bonding is the process of connecting two or more metal objects together
with a conductor. ú D. During normal pressure refueling of the airplane: ú (1) An electrical bond is necessary between the airplane and the ú refueling vehicle. ú (2) Static grounding is not necessary as long as the conductivity of the ú airplane and the parking site are adequate (AMM task Measure ú Airplane Electrical Resistance to Ground within this procedure). ú (a) The operator must ensure that the conductivity of the airplane ú and the parking site is adequate and may need to establish ú local procedures in areas where parking site conductivity is ú seasonal or permanent. ú (b) Parking site conductivity may be inadequate on dry snow, dry ú sand or in areas of low moisture. ú E. Static grounding is necessary: ú (1) During overwing refueling. ú (2) When performing maintenance tasks using these devices: ú (a) Power Tools ú (b) Electrical Power Sources ú (c) Lights ú (d) Powered Instruments ú F. Static grounding is not necessary if the airplane is parked for a ú turnaround flight and no maintenance is to be done.
G. When static grounding is recommended in a detailed procedure, the airplane must be statically grounded to a common, approved, identified ground. Where a grid system is used, any number of individual grounds will provide a common ground, since all grounds are interconnected. If an area does not have a grid system, a single approved and identified ground must be used as the common ground for all grounding cables used.
H. Stop ground servicing operations, external to the airplane, during electrical storms.
I. Electrostatic Grounding - Parked Airplane ú J. The airplane is normally electrostatically grounded through conductive ú tires (AMM task Measure Electrical Resistance to Ground within this ú procedure). However, static grounding is necessary for:
(1) Airplanes having inadequate conductivity to ground through the tires.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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A 737-300/400/500MAINTENANCE MANUAL
ú (2) Airplanes on parking sites that have inadequate conductivity.
K. Should operators elect not to follow this recommended procedure, they should develop alternate procedures or establish conditions adequately protecting the personnel and equipment involved. Local fire codes and customs may require alternative or additional procedures to those defined here.
TASK 20-40-11-862-001
2. Static Ground Procedure (Fig. 201)
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A. Access
(1)
Location Zones
731 Left Main Landing Gear
741 Right Main Landing Gear
B.
Grounding Procedure:
S 422-012
WARNING: DO NOT CONNECT A HEADSET AND DO NOT TOUCH CONNECTIONS TO THE
_______ AIRPLANE DURING ATMOSPHERIC ELECTRICAL ACTIVITY OR IN STRONG ELECTROMAGNETIC FIELDS. LIGHTNING STRIKE AND HIGH DISCHARGE CURRENTS CAN CAUSE SEVERE INJURY.
ALWAYS ATTACH THE GROUNDING CABLE TO THE GROUND CONNECTION FIRST. NEVER ATTACH THE CABLE TO THE AIRPLANE AND THEN TO THE GROUND CONNECTION.
CAUTION: ATTACH GROUNDING CABLES ONLY TO SPECIFIED POINTS ON THE
_______ AIRPLANE. INCORRECTLY ATTACHED GROUNDING CABLES CAN CAUSE SCRATCHES WHICH CAN CAUSE CORROSION AND CRACKS ON STRESSED PARTS. GROUND WIRES ATTACHED TO DOORS OR FAIRINGS MADE FROM COMPOSITE MATERIALS DO NOT PROVIDE A GROUND.
(1) Attach grounding cable to a static ground and to the airplane in the following sequence:
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