FQIS - FQIC Pin Programming Parity Error

TASK 28-42-00-810-850-A
FQIS - FQIC Pin Programming Parity Error

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: EN50020, UL913 OR EQUIVALENT). TEST EQUIPMENT THAT IS NOT APPROVED CAN CAUSE FIRE OR AN EXPLOSION.

1. Possible Causes

aircraft wiring between the FQIC (3QT) rack connector and terminal block (202VT) 92VU122
FQIC [3QT]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 284201
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)

3. Fault Confirmation
Subtask 28-42-00-865-083-A ** ON A/C NOT FOR ALL

A. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	FUEL/FQI/CHAN/1	1QT	A13
121VU	FUEL/FQI/CHAN/2	2QT	M27

Subtask 28-42-00-710-099-A ** ON A/C NOT FOR ALL

B. To keep the number of computer removals to a minimum do the Power On BITE test of the FQI system as follows:
(1) Apply electrical power to the FQI system.

OR (if the FQIS is already powered).

Reset the FQIC. (Open, then after 10 seconds, close the two CBs 1QT and 2QT).
(2) When the BITE test is complete (XX shown on the FQI for 35 seconds and the display has no dashes for 60 seconds) set the MCDU to:
(a) CFDS
(b) SYSTEM REPORT/TEST
(c) FUEL
(d) FQIS STATUS.
(3) Examine the FQIS STATUS page to see if it agrees with the initial defect.
(4) If the PIN PRG PARITY ERROR 3QT message is not shown:

maintenance steps are not necessary.

4. Fault Isolation
Subtask 28-42-00-810-099-A ** ON A/C NOT FOR ALL

A. If the PIN PRG PARITY ERROR 3QT message is shown in Para. 3.B.(3):

on the MCDU set to INPUT PARAMETERS, Page 3.

(1) Do a check of the bit location H1:

make sure that it shows a 1.

(2) Do a check of the bit locations G1 and K1:

make sure they both show a 0.

(3) If the bits identified in Para 4.A. (1) and (2) above are not correct:

do a check of the aircraft wiring between the FQIC (3QT) rack connector and terminal block (202VT) 92VU122 as shown in the table below, and ASM 284201.

Table of the FQIC pin programming connections with the FQIs shown in kilogrammes (kg)

Bit position	Signal discription	FQIC Pin allocation	Terminal Block 202VT allocation	Term. Block 202VT Signal level
H1 G1 K1	A320/321 KG/LBS Program pin parity	C05E C06E C05G	16J 13A 13V	Ground/earth Not connected Not connected

(4) Repair all the unserviceable wiring and connectors.
(5) Do the procedure given in Para 3.B.
(6) If the fault continues replace the FQIC [3QT] , AMM 28-42-34-000-001 and AMM 28-42-34-400-001.

NOTE: Make sure that the FQIC to be installed is of the same type as that removed. (Simmons Precision - Sextant Avionique).

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