Core Exhaust Nozzle Type Discrepancy on Engine 1

TASK 73-20-00-810-977-A
Core Exhaust Nozzle Type Discrepancy on Engine 1

1. Possible Causes

J14 Identification connector
ECU [4000KS]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 73-21-60-000-001	Removal of the Electronic Control Unit (ECU)
AMM 73-21-60-400-001	Installation of the Electronic Control Unit (ECU)
AMM 73-21-60-740-005	Entry of the Core Chevron Nozzle Status Through MCDU
AMM 73-21-90-000-002	Removal of the Engine Identification Connector
AMM 73-21-90-400-002	Installation of the Engine Identification Connector
AMM 73-21-90-860-001	Programming of the Identification Plug (Push-Pull Design) for SAC engines
AMM 73-29-00-710-040	Operational Test of the FADEC on the ground (with Engine Motoring)

3. Fault Confirmation
Subtask 73-20-00-710-324-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the operational test of the FADEC on the ground (with engine non motoring) AMM 73-29-00-710-040.

4. Fault Isolation
Subtask 73-20-00-810-279-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message J14WRONG, ECU ENTRY:

Visually verify the nozzle configuration:

NOTE: There are two configuration of core exhaust nozzle.
- Standard nozzle configuration is identified by a smooth conical exit surface
- Core chevron nozzle configuration is identified by 8 chevrons (triangular) around the circumference of the exit surface (SB RA32078-118).

(1) If a standard nozzle configuration is physically installed:

On the left or right MCDU, get access to the ENGINE MAIN MENU screen.
Push the line key (3L) adjacent to the LRU IDENT REPORT:

(a) If the MCDU screen indicates CCNECU N and CCNIDP Y:

Replace the J14 Identification connector AMM 73-21-90-000-002 and AMM 73-21-90-400-002 or Do Re-programming of the Identification Connector (Push-pull design only) to a standard nozzle configuration AMM 73-21-90-860-001.

(b) If the MCDU screen indicates CCNECU Y and CCNIDP N:

Do a configuration change of the Core Chevron Nozzle status on LRU IDENT REPORT AMM 73-21-60-740-005.

replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.

(2) If a core chevron nozzle configuration is physically installed:

On the left or right MCDU, get access to the ENGINE MAIN MENU screen.
Push the line key (3L) agjacent to the LRU IDENT REPORT:

(a) If the MCDU screen indicates CCNECU Y and CCNIDP N:

Replace the J14 Identification connector AMM 73-21-90-000-002 and AMM 73-21-90-400-002 or Do Re-programming of the Identification Connector (Push-pull design only) to a core chevron nozzle configuration AMM 73-21-90-860-001.

(b) If the MCDU screen indicates CCNECU N and CCNIDP Y:

Do a configuration change of the Core Chevron Nozzle status on LRU IDENT REPORT AMM 73-21-60-740-005.

replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.

Subtask 73-20-00-710-325-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.A.

[Rev.8 from Aug 2018] 2026.04.04 04:35:32 UTC