(3) If the message 284617 DUMMY TEMP SENSOR 42QJ is not shown:
- maintenance steps are not necessary.
NOTE : You can get more data from the:
____
- Aircraft Maintenance Manual (AMM) Chap. 28-46-00, the Fuel Level Sensing System, Description and Operation (D and O)
- Trouble Shooting Manual (TSM) - Task Supporting Data (Ref.
P. Block 301)
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : 301-399, ∞∞28-46-00∞∞∞∞∞∞∞∞∞∞Page A279
May 01/05 CES
- Aircraft Schematic Manual (ASM) (Ref. ASM 28-46/04). You can get more Trouble-shooting data from the CFDS(FUEL):
- Input Parameters Page 3 (Ref. P. Block 301)
- Trouble-shooting Data (Ref. P. Block 301).
4. Fault Isolation
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A. If the MCDU shows the message 284617 DUMMY TEMP SENSOR 42QJ:
(1) Do a resistance check of the dummy sensor 42QJ at the terminal block 202VT(92VU) between terminals 23F and 23K (Ref. AWM 28-46-12). Make sure the resistance is between 135 and 165 ohms. If the resistance is:
- within range as specified above, go to Step (2)
- not within range as specified above or open circuit, go to Step (4).
(2) Replace the FLSCU-2 (9QJ), (Ref. AMM TASK 28-46-34-000-001) and (Ref. AMM TASK 28-46-34-400-001).
(3) If the fault continues:
(a) Do a check (Ref. AWM 28-46-12) of the aircraft wiring (dummy sensor input line - H) between the FLSCU-2 rack connector AB, pin 7D and the terminal block 202VT, terminal 23A.
(b) Do a check (Ref. AWM 28-46-12) of the aircraft wiring (dummy sensor input line - L) between the FLSCU-2 rack connector AB, pin 7C and the terminal block 202VT, terminal 23H.
(c) Do a check (Ref. AWM 28-46-12) of the aircraft wiring (FLSCU-2 BITE 4 test command line) between the FLSCU-2 rack connector AA, pin 15D and the FQIC rack connector AB, pin 13E.
(d) Do a check (Ref. AWM 28-46-12) of the aircraft wiring (FLSCU-2 T2 output line) between the FLSCU-2 rack connector AB, pin 4D and the FQIC rack connector AC, pin 4F.
(e) Repair all the unserviceable wiring and connectors.
(f) Do the test in Para. 3.A.
(4) If the fault continues or if the resistance of the dummy sensor is not in range in Step (1):
(a) Replace the RESISTOR (42QJ).
(b) Do the test in Para. 3.A.
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : 301-399, ∞∞28-46-00∞∞∞∞∞∞∞∞∞∞Page A280
May 01/05 CES
TASK 28-46-00-810-846
FUEL - FOB BELOW 3 T Memo Message Not Shown
WARNING : OBEY THE FUEL SAFETY PROCEDURES.
_______
WARNING : WHEN YOU DO WORK ON THE FUEL SYSTEM WIRING, YOU MUST USE TEST
_______ EQUIPMENT THAT IS APPROVED (REFER TO INTERNATIONAL OR NATIONAL SPECIFICATIONS FOR INTRINSICALLY SAFE TEST EQUIPMENT, E.G. EN50-020, UL913 OR EQUIVALENT). TEST EQUIPMENT THAT IS NOT APPROVED CAN CAUSE FIRE OR AN EXPLOSION.
1. Possible Causes
_______________
- FLSCU-1 (7QJ)
- FLSCU-2 (9QJ)
- SDAC-1 (1WV1)
- SDAC-2 (1WV2)
- aircraft wiring
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 28-46-00-740-001 Functional (BITE) Test AMM 28-46-34-000-001 Removal of the Fuel-Level Sensing Control-Unit (FLSCU) (7QJ,9QJ) AMM 28-46-34-400-001 Installation of the Fuel-Level Sensing Control-Unit
(FLSCU) (7QJ,9QJ)
AMM 31-55-34-000-001 Removal of the SDAC (1WV1,1WV2)
AMM 31-55-34-400-001 Installation of the SDAC (1WV1,1WV2)
ASM 28-46/02
3. Fault Confirmation
__________________
A. Table of the circuit breakers used in this procedure:
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU SDAC/1/SPLY 3WV F04 121VU EIS/SDAC/2/SPLY 2WV Q06
B. During normal operation of the FLSS/FWC/DMC this is a configuration memo. If in either wing tank a pair of low level sensors that are AND gated together become dry indicating a fuel level of less than approximately 1500kg (3300lb) the memo message is given. It is not a warning of a system/LRU failure or malfunction.
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