of tools and material, location of next higher level of
Cleaning is accomplished by the use of a .38
maintenance, and operational needs. To the extent
caliber wire bore brush and a small amount of Neats
possible, all repairs should be made locally.
or Vaseline. After using the wire brush to remove dirt
and corrosion in the contacts, wipe them clean with a
REPAIRING POWER CABLES
rag. To ensure all dirt and corrosion have been removed
and that no parts of the rag remain in the contacts,
The power output cables that carry current to start
inspect each contact after wiping.
or service aircraft can only function if they are properly
Special tools for working on cables are shown in
constructed and maintained. Improper and
figure 7-60. The rod is used to pull the conductor so it
nonstandard procedures used in the assembly or repair
will be properly seated in the plug. The contact holding
of cable assemblies and attachable plugs can lead to
key allows the hex rod to turn without twisting the
premature failure and possible safety hazards.
contact. Torque of the contacts to the conductors is 70
At the local level, repair is limited to the attachable
in-lb. and 50 in-lb for control contacts.
plugs (fig. 7-59). Such procedures include cleaning,
torquing, and repairing or installing new conductors
As noted, proper tools and standardized
and contacts. If the cable itself is cut or worn, it must be
procedures are a must for this job. Correct tinning and
replaced. You are not authorized to tape or splice a
crimping procedures are outlined in Intermediate
damaged cable.
Maintenance Instructions for Repair and Assembly of
External Power Cables and Attachable Plugs ,
MS 25487
NAVAIR 17-1-116, as well as the proper steps for
D. C. JET STARTING
replacing a damaged plug.
ATTACHABLE PLUG HEAD
Q7-26. What action should you take for repairing a
cut or worn power cable?
1.
Tape it with electrical tape
2.
Splice the damaged area
3.
Replace the worn cable
4.
Solder a connector over the worn area
MS 25488
and insulate it with heat shrink
D. C. SERVICING
ATTACHABLE PLUG HEAD
Q7-27. Which of the following manuals should you
use to repair an external power cable?
1.
NAVAIR 17-1-110
2.
NAVAIR 17-1-116
3.
NAVAIR 17-1-125
4.
NAVAIR 17-1-129
ELECTRICAL LOAD BANK
LEARNING OBJECTIVES: Identify the
MS 25486
components of electrical load banks. Identify
A. C. SERVICING
procedures for troubleshooting and
ATTACHABLE PLUG HEAD
maintaining electrical load banks.
The electrical load bank or dummy load, as it is
often referred to in the fleet, is designed to apply ac and
dc test loads to all types of 400-Hz and 28-volt dc
power plants. The load bank can also test a motor
generator set like the MMG-1A. It is designed for
shore-based or shipboard use. Most AS personnel
ASf07059
probably recognize this unit as the MLB-1A. With a
Figure 7-59.--Models of attachable head plugs.
new manufacturer, however, the designation has
7-51
