**ON A/C ALL

DETECTORS, ADVANCE PNEUMATIC − ENGINE PRIMARY ZONE − REMOVAL AND

INSTALLATION

TASK 26−11−01−000−801

Removal of the Engine Primary−Zone Advance Pneumatic Detector

1. General

A. The maintenance procedure that follows is for the removal 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 26−11−01−946−001

A. Reference Information

REFERENCE DESIGNATION

TASK 24−00−00−861−802 De−energize the Electrical System

TASK 24−00−00−910−801 Electrical/Electronic Safety Precautions

3. Job Set−Up

Subtask 26−11−01−861−002

A. Make sure the aircraft electrical system is de−energized (Refer to

TASK 24−00−00−861−802 ).

Subtask 26−11−01−910−001

B. Obey the electrical/electronic safety precautions (Refer to TASK 24−00−00−910−801 ).

Subtask 26−11−01−865−001

C. Open and tag the circuit breakers that follows:

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 26−11−01−010−001

D. Open 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

AIRCRAFT MAINTENANCE MANUAL

MASTER

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

Dec 05/2005
REFERENCE DESIGNATION

422BR R/H NACELLE DOOR

422ET R/H NACELLE PANEL

4. Procedure

Subtask 26−11−01−020−001

Refer to Figure 401.

A. Remove the APD as follows:

(1) Disconnect the electrical connector (27) from the APD (28).

(2) Remove the screws (12), washers (8), nuts (9) and single−loop clamps (7) from the

aircraft structure. Refer to View C.

(3) Remove the grommets (11) and sensing element (10) from the single−loop clamps

(7).

(4) Remove the grommets (11) from the sensing element (10).

(5) Remove the screws (15), washers (16), nuts (18), and single−loop clamps (17) from

the aircraft structure. Refer to View D.

(6) Remove the grommets (14) and sensing element (13) from the single−loop clamps

(17).

(7) Remove the grommets (14) from the sensing element (13).

(8) Turn the screws that are attached to the hinged clamps (21) one quarter turn

counterclockwise.

(9) Open the hinged clamps (21).

(10) Remove the grommets (19) and sensing element (20) from the hinged clamps (21).

Refer to View F.

(11) Remove the grommets (19) from the sensing element (20).

(12) Remove the screws (15), washers (16), nuts (18), and single−loop clamps (17) from

the aircraft structure. Refer to View D.

(13) Remove the grommets (14) and sensing element (13) from the single−loop clamps

(17).

(14) Remove the grommets (14) from the sensing element (13).

(15) Remove the screws (6), washers (2), nuts (3), and single−loop clamps (1) from the

aircraft structure. Refer to View B.

(16) Remove the grommets (5) and sensing element (4) from the single−loop clamps

(1).

(17) Remove the grommets (5) from the sensing element (4).

(18) Turn the screws that are attached to the hinged clamps (21) one quarter turn

counterclockwise.

(19) Open the hinged clamps (21).

(20) Remove the grommets (19) and sensing element (20) from the hinged clamps (21).

Refer to View F.

AIRCRAFT MAINTENANCE MANUAL

MASTER

EFFECTIVITY: See Pageblock 26−11−01 page 401 26−11−01 Page 402

Dec 05/2005
(21) Remove the grommets (19) from the sensing element (20).

(22) Remove the split seal (22) from the seal assembly (23). Refer to View G.

(23) Pull the sensing element (24) through the seal assembly (23).

(24) Turn the screws that are attached to the hinged clamps (21) one quarter turn

counterclockwise.

(25) Open the hinged clamps (21).

(26) Remove the grommets (19) and sensing element (20) from the hinged clamps (21).

Refer to View F.

(27) Remove the grommets (19) from the sensing element (20).

(28) Hold the APD (26).

(29) Remove the bolts (25), washers (26), nuts (29) and saddle clamps (30) from the

aircraft structure. Refer to View E.

(30) Remove the saddle clamps (30) from the APD (28).

(31) Remove the APD (28) from the aircraft structure.

AIRCRAFT MAINTENANCE MANUAL

MASTER

EFFECTIVITY: See Pageblock 26−11−01 page 401 26−11−01 Page 403

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 401 (Sheet 1 of 2)

MASTER

EFFECTIVITY: See Pageblock 26−11−01 page 401 26−11−01 Page 404

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 401 (Sheet 2 of 2)

MASTER

EFFECTIVITY: See Pageblock 26−11−01 page 401 26−11−01 Page 405

Dec 05/2005