TASK 26−11−01−400−801

Installation of the Engine Primary−Zone Advance Pneumatic Detector

1. General

A. The maintenance procedure that follows is for the installation of the engine primary zone

advance pneumatic detector (written as the “APD” in these procedures). The APD is

installed in the left and right engine nacelles.

2. Job Set−Up Information

Subtask 26−11−01−946−002

A. Reference Information

REFERENCE DESIGNATION

TASK 26−11−00−710−801 Operational Test of the Nacelle Fire Detection

System

3. Job Set−Up

Subtask 26−11−01−860−002

A. Make sure that the aircraft is in the same configuration as in the removal task.

4. Procedure

Subtask 26−11−01−420−001

Refer to Figure 402.

A. Install the APD as follows:

NOTE: Make sure that the surfaces are clean with no corrosion, paint, grease, or

preservation fluids.

(1) Install the saddle clamps (30) on the APD (28).

(2) Install the saddle clamps (30) to the aircraft structure with the bolts (25), the

washers (26) and the nuts (29).

(3) Attach the grommets (19) onto the sensing element (20).

(4) Put the grommets (19) and sensing element (20) in the hinged clamps (21). Refer

to View F.

(5) Close the hinged clamps (21) which lead to the seal assembly (23).

(6) Turn the screws attached to the hinged clamps (21) one quarter turn clockwise.

(7) Put the sensing element (24) through the seal assembly (23).

(8) Install the split seal (22) around the sensing element (24).

(9) Attach the grommets (19) to the sensing element (20).

(10) Put the grommets (19) and sensing element (20) in the hinged clamps (21). Refer

to View F.

(11) Close the hinged clamps (21).

AIRCRAFT MAINTENANCE MANUAL

MASTER

EFFECTIVITY: See Pageblock 26−11−01 page 401 26−11−01 Page 406

Dec 05/2005
(12) Turn the screws attached to the hinged clamps (21) one quarter turn clockwise.

(13) Attach the grommets (5) to the sensing element (4).

(14) Put the grommets (5) and the sensing element (4) in the single−loop clamps (1).

Refer to View B.

(15) Attach the screws (6), washers (2) and nuts (3) to the single−loop clamps (1).

(16) Attach the grommets (14) to the sensing element (13).

(17) Put the grommets (14) and the sensing element (13) in the single−loop clamps (17).

Refer to View D.

(18) Attach the screws (15), washers (16) and nuts (18) to the single−loop clamps (17).

(19) Attach the grommets (19) to the sensing element (20).

(20) Put the grommets (19) and sensing element (20) in the hinged clamps (21). Refer

to View F.

(21) Close the hinged clamps (21).

(22) Turn the screws attached to the hinged clamps (21) one quarter turn clockwise.

(23) Attach the grommets (14) to the sensing element (13).

(24) Put the grommets (14) and the sensing element (13) in the single−loop clamps (17).

Refer to View D.

(25) Attach the screws (15), washers (16) and nuts (18) to the single−loop clamps (17).

(26) Attach the grommets (11) to the sensing element (10).

(27) Put the grommets (11) and the sensing element (10) in the single−loop clamps (7).

Refer to View C.

(28) Attach the screws (12), washers (8) and nuts (9) to the single−loop clamps (7).

(29) Connect the electrical connector (27) to APD (28).

5. Close Out

Subtask 26−11−01−865−002

A. Remove the tags and close the circuit breakers that follow:

CB PANEL AND CB NO NAME

LEFT DC (ESSENTIAL), K7 FIRE DET ENG 1 IND

RIGHT DC (ESSENTIAL), J7 FIRE DET ENG 2 IND

Subtask 26−11−01−941−001

B. Remove all tools, equipment, and unwanted materials from the work area.

Subtask 26−11−01−710−001

C. Do the operational test of the nacelle fire detection system (Refer to

TASK 26−11−00−710−801 ).

AIRCRAFT MAINTENANCE MANUAL

MASTER

EFFECTIVITY: See Pageblock 26−11−01 page 401 26−11−01 Page 407

Dec 05/2005
Subtask 26−11−01−410−002

D. Close the access doors/panels that follow:

REFERENCE DESIGNATION

412BL L/H NACELLE DOOR

412BR L/H NACELLE DOOR

412ET L/H NACELLE PANEL

422BL R/H NACELLE DOOR

422BR R/H NACELLE DOOR

422ET R/H NACELLE PANEL

AIRCRAFT MAINTENANCE MANUAL

MASTER

EFFECTIVITY: See Pageblock 26−11−01 page 401 26−11−01 Page 408

Dec 05/2005
A

A

F

B

C

E

FWD

A

D

wk108a01.cgm 15 Oct 98

G

B

C

12

7

8

9

6

1

2

3

4

5

10

11

LEGEND

1. Single−loop clamp.

2. Washer.

3. Nut.

4. Sensing element.

5. Grommet.

6. Screw.

7. Single−loop clamp.

8. Washer.

9. Nut.

10. Sensing element.

11. Grommet.

12. Screw.

AIRCRAFT MAINTENANCE MANUAL

Engine Primary Zone Advance Pneumatic Detector − Removal/Installation

Figure 402 (Sheet 1 of 2)

MASTER

EFFECTIVITY: See Pageblock 26−11−01 page 401 26−11−01 Page 409

Dec 05/2005
wk108a02.cgm 16 Oct 98

FWD

D

E

G

F

18

17

16

15

14

27

28

30

26

25

29

19

21

22

23

24

13

LEGEND

13. Sensing element.

14. Grommet.

15. Screw.

16. Washer.

17. Single−loop clamp.

18. Nut.

19. Grommet.

20. Sensing element.

21. Hinged clamp.

22. Split seal.

23. Seal assembly.

24. Sensing element.

25. Bolt.

26. Washer.

27. Electrical connector.

28. APD.

29. Nut.

30. Saddle clamps.

20

AIRCRAFT MAINTENANCE MANUAL

Engine Primary Zone Advance Pneumatic Detector − Removal/Installation

Figure 402 (Sheet 2 of 2)

MASTER

EFFECTIVITY: See Pageblock 26−11−01 page 401 26−11−01 Page 410

Dec 05/2005