20-41-00
ú ALL ú
ú ú ú 01.101 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. Page 203Sep 28/02
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757 MAINTENANCE MANUAL
S 022-014
(2) Before the airplane is moved, remove the bonding cables from the airplane.
TASK 20-41-00-762-015
4. Measure Airplane Electrical Resistance to Ground
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A. Equipment
(1) Ohmmeter-Multimeter
B. Reference
(1)
AMM 24-22-00/201, Supply Power Control
(2)
AMM 24-41-02/201, External Power Receptacle
C. Prepare to Check
S 042-016
(1)
Remove electrical power from the airplane (AMM 24-22-00/201).
S 042-022
(2)
Remove or De-energize any External Powered devices.
S 762-027
(3)
Do a continuity check from the neutral pin of the external power receptacle to the grounding stud (AMM 24-41-02/201).
S 042-023
(4)
Disconnect airplane static ground cables if connected.
S 422-017
(5)
Connect an ohmmeter between the recognized bonding/grounding point on the Primary Landing gear and on an identified ground point on the ramp or the surface of the ramp on which the airplane is parked.
S 762-018
(6)
Measure the resistance to ground and record in the maintenance log.
(a) Make sure the resistance is less than 1.0 megohms.
1) If the resistance to ground is greater than 1.0 megohms, do the following: a) Ensure the airplane is not parked over painted surfaces
and that the tires provide sufficient conductivity.
b) Repeat the measurement at other parking site locations where successful measurement have been made to verify sufficient airplane conductivity.
NOTE: This will make sure the airplane has sufficient
____
conductivty. c) Record the reading in the airplane logbook. d) Advise flight crews of subsequent flights that
insufficient conductivity to ground is present through the tires to electrostatically ground this airplane on a parking surface. Static ground procedures may apply.
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20-41-00
ú ALL ú
ú ú ú 01.101 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. Page 204Sep 28/02
A
757 MAINTENANCE MANUAL
(7) S 422-024Connect airplane static ground cables if required.
(8) S 862-026Put the Airplane Back to Its Usual Condition
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20-41-00
ALL ú ú 01 Page 205 ú Sep 28/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
SEE A GEAR LANDING NOSE
(REF) OF NOSE LANDING GEAR P63 PANEL FAR SIDE P62 PANEL
BSEE GEAR LANDING MAIN BONDING JUMPER
FWD
CSEE GEAR TRUCK MAIN LANDING A NOSE LANDING GEAR
FWD INBD MAIN GEAR SHOCK STRUT (REF)
B MAIN LANDING GEAR FWD GROUNDING STUD
C MAIN LANDING GEAR TRUCK
Static Grounding
Figure 201
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20-41-00
ALL ú ú 01 Page 206 ú Sep 28/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
ELECTROSTATIC DISCHARGE SENSITIVE DEVICES - MAINTENANCE PRACTICES
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1. General (Fig. 201)_______
A. Many electronic line replaceable units (referred to as LRUs) contain micro-circuits and other sensitive devices which can be damaged internally by electrostatic discharges. These LRUs are identified as Electrostatic Discharge Sensitive (referred to as ESDS). The placards installed on the ESDS LRUs show that you must be careful. The persons who remove, install, and move the ESDS LRUs must know about static electricity and the protection from static discharges that is necessary.
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