20-41-00
ALL ú ú 01.1 Page 201 ú Sep 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
ú (2) Electrostatic Grounding - Parked Airplane ú (3) The airplane is normally electrostatically grounded through ú conductive tires (AMM task Measure Electrical Resistance to Ground ú within this procedure). However, static grounding is necessary for: ú (a) Airplanes with inadequate conductivity to ground through the
tires. ú (b) Airplanes on parking sites that have inadequate conductivity. ú 1) The operator should ensure the adequacy of airplane and ú parking area conductivity and may need to establish local ú procedures in areas where inadequate parking site ú conductivity is seasonal or permanent. ú 2) Parking site conductivity may be inadequate on dry snow, ú dry sand or in areas of low moisture.
I. 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 20-41-00-862-009
2. Static Ground Procedure (Fig. 201)
_______________________
A. Access
(1) Location Zones
711 Nose Landing Gear
731 Left Main Landing Gear
741 Right Main Landing Gear
B. Grounding Procedure:
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
20-41-00
ALL ú ú 01.1 Page 202 ú Sep 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
S 422-020
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:
(a)
Connect the grounding cable to an approved, identified static ground point. These points may be located in the parking surface or in another fixed location.
(b)
Connect the grounding cable to approved grounding attach point on the airplane. These points are identified in Fig. 201.
S 022-011
(2) Before the airplane is moved, remove the ground cables from the approved grounding attach point on the airplane.
TASK 20-41-00-762-012
3. Bonding Procedure_________________
A. Procedure:
S 422-021
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.
CAUTION: ATTACH BONDING CABLES ONLY TO SPECIFIED POINTS ON THE AIRPLANE.
_______ INCORRECTLY ATTACHED BONDING CABLES CAN CAUSE SCRATCHES WHICH CAN CAUSE CORROSION AND CRACKS ON STRESSED PARTS. BOND WIRES ATTACH TO DOORS OR FAIRINGS MADE FROM COMPOSITE MATERIALS DO NOT PROVIDE A BOND.
(1) Connect a bonding cable to a recognized bonding or grounding point on the airplane and a recognized grounding or bonding point on the support equipment in use.
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