**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

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# 26 − 11 − 01 Page 401 Dec 05/2005REFERENCE 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

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# 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

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# 26 − 11 − 01 Page 403 Dec 05/2005A

A F B C E FWD A

Dwk108a01.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 05/2005wk108a02.cgm 16 Oct 98 FWD D

E

G F 18 17 16 15

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30 26 25 29 19

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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