TM 11-6625-3087-12
APPENDIX B
MAINTENANCE ALLOCATION CHART (MAC)
Table 1. MAC for Frequency Selective Level Meter, AN/USM-490
(1)
(2)
(3)
(5)
(6)
(4)
MAINTENANCE LEVEL
GROUP
MAINTENANCE
TOOLS AND
FIELD
SUSTAINMENT
NUMBER
COMPONENT/ASSEMBLY
FUNCTION
EQUIPMENT
REMARKS
UNIT
DS
GS
DEPOT
CO
F
H
D
00
Frequency Selective Level
INSPECT
0.5
1
1
Meter, AN/USM-490
TEST
0.5
1
2
SERVICE
0.5
1
3
INSPECT
1.0
2
4
TEST
1.0
2, 5, 6, 7-43
5
ADJUST
1.0
2-14,16-
6
18,25,40-42
CALIBRATE
1.0
2,5-7,14,16-
7
18,25-42
REPAIR
8.2
2-43
8
REPAIR
1.0
1
REPAIR
10.0
2-43
9
01
Circuit Card Assembly A1
INSPECT
0.2
2
(Input Multiplexer)
TEST
0.5
2,4,6,8,12,17,
21,25
REPAIR
1.0
2,3,18,21
5
02
Circuit Card Assembly A2
INSPECT
0.2
2
(Input Amp)
TEST
0.5
2,4-8,13,17-
18,21,25
REPAIR
2,3,5-
5
7,12,18,21,25
03
Circuit Card Assembly A4
INSPECT
0.2
2
(Broadband Pwr/Cal/Overld)
TEST
0.5
2,4-6,8-12,17
REPAIR
2,3,5,6,12
5
04
Circuit Card Assembly A5
INSPECT
0.2
2
(Input Mixer)
TEST
0.5
2,4-6,8-
10,12,17,18,25
REPAIR
1.0
2,3,5,6,10,12,1
5
8,25
05
Circuit Card Assembly A10
INSPECT
0.2
2
(Second Mixer)
TEST
0.5
2,4,5,8,11,12,1
4,18,18,25
REPAIR
1.0
2,3,5,6,11,12,1
5
4,17,25,33
06
Circuit Card Assembly A11
INSPECT
0.1
2
(Second LO)
TEST
0.5
2,4,5,6,8,10,
12,16,17
REPAIR
1.0
2,3,5,12
5
07
Circuit Card Assembly A15
INSPECT
0.2
2
(Tracking Output)
TEST
0.5
2,4,5,8,12,16,
17
REPAIR
1.0
2,3,5,12
5
08
Circuit Card Assembly A16
INSPECT
0.2
2
(10MHz Freq Ref)
TEST
0.5
2,4-
6,8,10,12,16,
REPAIR
1.0
17
2,3,5,12
5
09
Circuit Card Assembly A20
INSPECT
0.1
2
(IF Filter)
TEST
0.5
2,4,5,8,11,12,
14,16,17
REPAIR
1.0
2,3,5,6,11,12,1
5
4.16,33
10
Circuit Card Assembly A21
INSPECT
0.2
2
(IF Gain/Det)
TEST
0.5
2,4,5,6,8,12,17
REPAIR
1.0
2,3,5,6,12
5
11
Circuit Card Assembly A22
INSPECT
0.2
2
(Analog-Digital Conv)
TEST
0.5
2,4-6,8,
12-16,17
REPAIR
1.0
2,3,5,12-17
5
12
Circuit Card Assembly A40
INSPECT
0.2
2
(Frequency Reference)
TEST
0.5
2,4-6,8-10,
12-16,17
REPAIR
1.0
2,3,5,12-16
5
13
Circuit Card Assembly A50
INSPECT
0.2
2
(Step Loop)
TEST
0.5
2,4,5,8,10,12,1
4,16,17
REPAIR
1.0
2,3,5,12,14,16
5
14
Circuit Card Assembly A60
INSPECT
0.2
2
(Controller)
TEST
0.5
2,4,5,8,12,16,
16
REPAIR
1.0
2,3,5,12
5
B-4 Change 1
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