(5)
 Connect the electrical connectors (5) and (6) to the Fire Detection Unit (1).

 Subtask 26-12-34-865-052
 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): FOR 2WD1 7WD1, 8WD1 FOR 2WD2 7WD2, 8WD2
 Subtask 26-12-34-860-051
 C. Do the EIS start procedure (Ref. TASK 31-60-00-860-001).

 Subtask 26-12-34-710-051

 D. Do this test:
 (1) On the upper ECAM DU, make sure that the FIRE ENG 1(2) DET FAULT message has gone out of view. 
R R R  (2) Do an operational test of the engine fire and overheat detection with the Centralized Fault Display System (CFDS) (Ref. TASK 26-12-00-710-002). 
R R (3) Do an operational check of loop/squib (Ref. TASK 26-12-00-710-001) 
5. Close-up________
 Subtask 26-12-34-860-052
 A. Do the EIS stop procedure (Ref. TASK 31-60-00-860-002).
 Subtask 26-12-34-410-050
 B. Close Access
 (1) Make sure that the work area is clean and clear of tool(s) and other items.
 (2) Remove the warning notice(s).
 (3) Close the access door 824 (Ref. TASK 52-41-00-410-002).
 (4) Remove the access platform(s).

 APU FIRE AND OVERHEAT DETECTION - DESCRIPTION AND OPERATION
___________________________________________________________
R 1. General_______
R The APU fire detection system operates on the pneumatic principle. It
R detects and indicates a fire or overheat condition in the APU compartment
R with two independent fire warning loops. The detection system is arranged
R with different descrimination levels for different combinations of fault and
R fire information.
R 2. Component Location__________________ (Ref. Fig. 001)
 -------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
 -------------------------------------------------------------------------------13WG FDU-APU 127 824 26-13-34 21WG DETECTOR-APU FIRE (LOOP A) 315 316AR 26-13-15 22WG DETECTOR-APU FIRE (LOOP B) 315 316AR 26-13-15
R 3. System Description__________________ (Ref. Fig. 002)
 A. The detection system consists of two identical (electrically independent) loops (A and B). They are installed in the APU compartment adjacent to critical components, such as:
 -fuel lines,
 -starter generator,
 -FCU,
 -ignition box,
 -turbine plenum.
 (1)
 Pneumatic Sensor Element (Ref. Fig. 003) The APU fire detector 21WG/22WG is a continous length, thermal sensing, pneumatic detector. Each detector has a stainless steel housed responder assembly with a length of stainless steel sensor tube permanently attached. The full assembly is welded, brazed and hermetically sealed. In the sealed responder housing are a 5-pin electrical connector and two pressure sensitive switches (alarm and integrity) in ceramic insulators. The sensor is a braze-sealed tube that contains a special core material and pressurized inert gas. The detector operates pneumatically. The APU fire detector sensing elements go along the fire walls. Dual clamps hold the sensing elements at the fire walls. The responder housings of the elements are connected to the terminal plate.

 (2)
 Fire Detection Unit (Ref. Fig. 001) The Fire Detection Unit 13WG (FDU) is installed in the avionics compartment. It includes two identical and independent circuits, one for each loop. They are installed on three printed circuit boards:

 -Input/Output (I/O) circuit board,
 -Loop A and Loop B circuit board,
 -Micro controller circuit board.

 (3)
 APU Fire Panel (Ref. Fig. 001) The ENG/APU FIRE panel 1WD is on the cockpit overhead panel (20VU). The middle part is related to the APU fire detection and includes:

 APU Fire and Overheat Detection - Comp. Location
 Figure 001 (SHEET 1)
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 1  1
 1CES  1

 APU Fire and Overheat Detection - Comp. Location
 Figure 001 (SHEET 2)
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1  1  Feb 01/98
 1  1
 1CES  1

R  APU Fire and Overheat Detection - Principle Diagram Figure 002 (SHEET 1)
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R  APU Fire and Overheat Detection - Principle Diagram Figure 002 (SHEET 2)
 1EFF : 1 1 1CES  ALL  1 111 26-13-00 Page 5 Nov 01/00

R  APU Fire and Overheat Detection - Principle Diagram Figure 002 (SHEET 3)
　
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