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3) Unscrew jam nut (3).
4) Unscrew fork end (4) or end (5) and discard lockwasher (2).
5) Install a new lockwasher (2).
6) Screw fork end (4) or end (5) to obtain the desired center—to—center distance.
7) Through witness hole (1), check that enough threads are engaged (threads visible through the witness
hole).
CAUTION : ONCE ADJUSTMENT IS COMPLETE, MAKE SURE A LOCKING DEVICE (COTTER
PIN OR LOCKWASHER) HAS BEEN INSTALLED ON HINGE AXLE (6).
8) Immobilize the rod with a spanner positioned on the flat surface of the rod end.
9) Screw jam nut (3) and fold down the tabs of new lockwasher (2).
 
1 — Witness hole
2 — Lockwasher
3 — Jam nut
4 — Fork end
5 — End
6 — Hinge axle
 
ELECTRICAL BONDING
MAINTENANCE PRACTICES
1. SERVICING
This section covers the procedure for electrical bonding of the aircraft following removal / installation or replacement of a component.
A. Tools and consumable materials
- Stainless steel bonding brush
- Alodine (TB 13-002)
- Petrolatum (TB 04-012)
- Abrasive cloth (TB 05-916C)
- Varnish (TB 07-906) or (TB 07-907)
- Cleaning agent (TB 11-912)
- Clean lintfree cloths
B. Procedure (Figure 201 and Table 201)
1) Strip contact surfaces with a bonding brush or abrasive cloth (TB 05-916C), as appropriate. The stripped diameter shall be 0.08 in (2 mm) greater than that of the ground strap lug.
2) Degrease the surfaces with a cloth moistened with cleaning agent (TB 11-912), then wipe with a dry cloth.
3) Protect the bare surfaces with alodine (TB 13-002), then rinse and let dry.
4) Lightly coat the surfaces with petrolatum (TB 04-012).
5) Immediately assemble the various parts and apply the recommended torque value ; tightening shall cause high contact pressure.
NOTE : If assembly cannot be performed within 15 minutes following the application of petrolatum (TB 04-012), the latter becomes a storage protection - see Table 201.
6) Thoroughly remove petrolatum (TB 04-012) excess with a clean cloth slightly moistened with cleaning agent (TB 11-912).
7) Cover the joint with a coat of varnish (TB 07-906) or (TB 07-907), overlapping the protected area with alodine.
NOTE : It is not necessary to ensure electrical bonding on a non painted part protected with alodine, however the contact surface must be cleaned and coated with petrolatum (TB 04-012).
Use varnish (TB 07-906) on masked surfaces and varnish (TB 07-907) on apparent surfaces.
 
1 — Bolt
2 — Bonding strap
3 — Washer
4 — Nut
 

 
Electrical bonding
Figure 201
 

  PETROLATUM
PROTECTION
　
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本文鏈接地址：TB20 MAINTENANCE MANUAL 20 STANDARD PRACTICES AIRFRAME TB20飛機維護手冊 20 標準施工機體(53)