TM 55-4920-401-13&P
CHAPTER 3
AVIATION UNIT MAINTENANCE INSTRUCTIONS
Section I. PREPARATION FOR INSTALLATION, STORAGE, AND SHIPMENT
3-1. UNPACKING. There are no special unpacking proce-
accessory case. Open the accessory case, remove the dessi-
dares. Unlatch and remove the instrument case from the
cant, and check for the items in table 3-1.
Table 3-1. Accessories List
BH112JB-79
BH112JB-53
Quantity
Quantity
1
1
1
1
1
1
1
1
1
1
1
1
1
1
3
1
1
1
1
1
1
Loosen the wing nuts on the handle and place handle in a
comfortable position for pushing. Retighten the wing nuts.
The tester is ready for use after unpacking. Operation
instructions are contained in the instrument case lid and
detailed operation instructions accompanied by setup illus-
trations are contained in Chapter 2.
3-2. PREPARATION FOR STORAGE. Before storing
the tester, place 5 eight-unit bags of dessicant (item 1, table
1-16) in the accessory case. Store the tester in a dry area
where the temperature range does not exceed-65 to 160°F (-
54 to 71 °C).
Part Number
Part Name
BH123-3
switch box
BH361-8
junction box
BH405
heater cable
BH450
check cable
BH485
instrument cable
BH492B-3
extension handle
BH499A
power cable
BH820
rpm check adapter
BH821
insulation check adapter
BH822
egt indicator check adapter
BH823
resistance check adapter
BH996-40
heater probes
BH1504
check cable adapter
BH4548
check cable adapter
BH361-12
junction box
BH15184A
interconnect cable
BH15185A
power cable adapter
3-3 PREPARATION FOR SHIPMENT. Place 5 eight-
unit bags of dessicant (item 1, table 1-16) in the accessory
case. Surround the tester with 2 inches of rubberized hog
hair when it is packed for shipment. Use the latest revision
of specification MIL-P-1 16, method IIb, and JAN-P-100. A
pallet (fig. 3-1) may be prepared to secure the tester in the
shipping carton. Four holes in the pallet are for tie-down
straps.
3-3.1. GENERAL INFORMATION FOR STORAGE
AND SHIPMENT. For general technical information on
preparation for storage and shipment, refer to TM 1-1500-
204-23 (series). For regulatory requirement pertaining to
equipment placed in administrative storage, refer to
AR750-1.
Section II. INSTALLATION
Not applicable.
Section III. INSPECTIONS AND SERVICING
3-4. DAILY INSPECTION. Following the unpacking of
condition of paint.
the tester and prior to each day’s operation, perform the fol-
lowing inspection procedures.
(2) Lift instrument case lid and examine instrument case deck
for broken knobs, broken meter glass, and damaged meter move-
a. Visual Inspection.
ments. INSULATION CHECK meter should be indicating in-
(1) Inspect exterior of tester for evidence of damage and
Change 5 3-1
