CAUTION: YOU MUST CLOSE THE CORE COWLS BEFORE THE THRUST REVERSERS TO
_______ PREVENT DAMAGE TO THE REVERSER OR THE COWL.
(7)
Close the core cowl panels and thrust reverser half (AMM 71-11-06/201 and 78-31-00/201).
S 864-128
(8)
Remove the DO-NOT-CLOSE tags and close the applicable circuit breakers as shown in Fig. 401.
S 864-129
(9)
Supply electrical power (AMM 24-22-00/201).
S 714-130
(10)
Do a test of the engine fire and overheat detection system (AMM 26-11-00/501).
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747-400 MAINTENANCE MANUAL
ENGINE FIRE AND OVERHEAT DETECTOR - INSPECTION/CHECK
____________________________________________________
1. General (Fig. 601)_______
A. AIRPLANES WITH KIDDE DETECTORS;
Detector element inspection.
(1) Four detection elements (T681, T682, T683, and T684) are installed in each engine on the airplane. The detection elements are installed on the top aft, bottom aft, top forward and bottom forward areas of each engine. Deep abrasions, cuts or physical damages on the elements and support tubes should be noted as these are causes of internal damage to the element and failure of the support tubes. The electrical connectors should be properly installed and free from nicks, moisture or fluid contamination and corrosion to make sure the system functions correctly.
B. AIRPLANES WITH SYSTRON DONNER DETECTORS;
Detector element inspection.
(1) Four detection elements (TS681, TS682, TS683, and TS684) are installed in each engine on the airplane. The detection elements are installed on the top aft, bottom aft, top forward and bottom forward areas of each engine. Deep abrasions, cuts or physical damages on the elements and support tubes should be noted as these are causes of internal damage to the element and failure of the support tubes. The electrical connectors should be properly installed and free from nicks, moisture or fluid contamination to make sure the system functions correctly.
C. The detector element can be accessed after you open the thrust reverser halves and the core cowl panels.
TASK 26-11-02-206-001
2. Check Detector Elements_______________________
A. Consumable Materials
(1)
B00338 - Cleaner, Acetone
(2)
B00543 - Cleaner, Methyl Alcohol
B. References
(1)
AMM 71-11-04/201, Fan Cowl Panels
(2)
AMM 71-11-06/201, Core Cowl Panels
(3)
AMM 78-31-00/201, Thrust Reverser System
(4)
AIPC 26-11-02, Fig.1
(5)
WDM 26-11-11 through WDM 26-11-43
(6)
SSM 26-11-01 through SSM 26-11-04
C. Access
(1) Location Zones
412 Engine 1
422 Engine 2
432 Engine 3
442 Engine 4
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747-400
MAINTENANCE MANUAL
DETECTOR TOP AFT DETECTOR TOP AFT DETECTOR TOP FORWARD
SEE A SEE A SEE A
BOTTOM AFT
DETECTOR
DETECTOR BOTTOM FORWARD SEE A DETECTOR BOTTOM AFT
SEE A SEE A
LEFT SIDE RIGHT SIDE
Engine Fire and Overheat Detector Inspection
Figure 601 (Sheet 1)
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