TM 10-1670-305-23&P
0021 00-5
TEST CHAMBER ASSEMBLY, MODEL 452
0021 00
UNIT MAINTENANCE
DISASSEMBLY
7. Hold elbow (20) stationary using a 5/8-in. backup wrench, and loosen lock nut (25)
approximately one turn using a 11/16-in. wrench. Elbow (20) may then be removed by hand.
8. Tag and disconnect three electrical leads to air compressor (13). Refer to connections decal
(15) inside of housing panel (6). Unscrew compression nut (11) and disconnect tubing (10)
from elbow (12).
NOTE
Observe routing of electrical leads from air compressor (13) to aid in assembly.
9. Remove three screws (31), washers (32), and compressor (13).
10. Tag and disconnect three electrical leads to vacuum pump (14). Refer to connections decal
(15) inside of housing panel (19). Unscrew compression nut (4) and disconnect tubing (9)
from elbow (3).
NOTE
Observe routing of electrical leads from vacuum pump (14) to aid in assembly.
11. Remove three screws (33), washers (34), and vacuum pump (14).
ALTIMETER CALIBRATION
Refer to direct support maintenance (WP 0024 00).
CLEANING
1. Clean exterior of air compressor (13), vacuum pump (14), and air cylinder (8) with isopropyl
alcohol (anhydrous). Air dry all parts thoroughly.
INSPECTION
1. Visually inspect all components for wear or damage.
2. Discard worn or damaged parts.
