FQIS - No ARINC Data From CFDIU

TASK 28-42-00-810-846-A
FQIS - No ARINC Data From CFDIU

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 284204
AMM 28-42-34-000-001	Removal of the Fuel Quantity-Indicating Computer (FQIC)
AMM 28-42-34-400-001	Installation of the Fuel Quantity-Indicating Computer (FQIC)
AMM 31-32-34-000-001	Removal of the CFDIU
AMM 31-32-34-400-001	Installation of the CFDIU

3. Fault Confirmation
Subtask 28-42-00-710-095-A

A. On the MCDU set the sequence that follows:

(1) If the message NO DATA FROM CFDIU is shown do the fault isolation:

NOTE: OPTIONAL TESTING
Where an ARINC Reader and test connectors are available, the ARINC data can be checked at:

4. Fault Isolation
Subtask 28-42-00-810-095-A

A. If the MCDU shows the message NO DATA FROM CFDIU:

temporarily replace the FQIC 3QT with a serviceable item AMM 28-42-34-000-001 and AMM 28-42-34-400-001.

NOTE: Para. A. has been included as it is important to make sure that the FQIC is serviceable before you start more steps.

(1) If the message NO DATA FROM CFDIU is not shown:

complete the installation of the FQIC [3QT] , AMM 28-42-34-000-001 and AMM 28-42-34-400-001.

(2) If the message NO DATA FROM CFDIU is shown:

(3) Replace the CFDIU [1TW] , AMM 31-32-34-000-001 and AMM 31-32-34-400-001.
(4) Do the test given in Para. 3.A.
(5) If the fault continues:

do a wiring check on the aircraft wiring data link between the CFDIU (1TW) and the FQIC (3QT) ASM 284204.

(6) Repair/replace all the unserviceable wiring and connectors.
(7) Do the test given in Para. 3.A.

[Rev.8 from Aug 2018] 2026.04.04 04:29:07 UTC