14. Place the desiccant cartridge in a vise, and turn
the end cover clockwise an additional 180 to 225
degrees to fully tighten the desiccant cartridge to
the end cover.
NOTE: Desiccant cartridge torque should not
exceed 50 lbf·ft (68 N·m).
15. Place the housing over the desiccant cartridge
and align the mounting holes with the end cover.
IMPORTANT: Replace, do not reuse the Nylok
nuts on the air dryer cover.
16. Install the 6 bolts, 12 washers, and 6 new Nylok
nuts. Torque the Nylok nuts in a star pattern 17
to 24 lbf·ft (23 to 33 N·m). See
17. Install the air dryer on the lower mounting
bracket. Install the two previously marked bolts,
four washers, and two new Nylok nuts. Torque
the two remaining Nylok nuts 17 to 24 lbf·ft (23
08/09/95
f421383
1
2
3
4
5
9
10
11
12
13
14
15
17
18
19
21
22
23
24
25
10
10
10
10
10
10
6
7
8
8
8
20
16
1.
5/16 x 4-1/2 Upper Mounting
Bracket Bolt
2.
Upper Mounting Bracket Strap
3.
Lockwasher
4.
5/16-Inch Nylok Nut
5.
Upper Mounting Bracket
6.
Housing
7.
Nylok Nut
8.
3/8-Inch Special Washer
9.
Desiccant Cartridge
10. O-Ring
11. Safety Valve
12. Lower Mounting Bracket
13. 3/8-Inch Bolt (long)
14. Check Valve Assembly
15. Purge Valve Assembly
16. Purge Valve Capscrew
17. Exhaust Diaphragm
18. Purge Valve
19. 1/4-Inch Tapping Screw
20. Purge Valve Housing
21. Heater and Thermostat
Housing
22. Return Spring
23. Purge Piston
24. 3/8-Inch Bolt
25. End Cover
Fig. 1, AD–9 Air Dryer (exploded view)
Brakes
42
Business Class M2 Maintenance Manual, November 2015
42/2
Property of American Airlines
