ELAC Fault at Electrical Power Up

TASK 27-93-00-810-964-A
ELAC Fault at Electrical Power Up

NOTE: This procedure is only applicable to:

ELACs L91/ L93/ L94 (PN 3945129101/ PN 3945129103/ PN 3945129104) or
ELAC L92 (PN 3945128208) or
ELAC L93 (PN 3945128209) or
ELAC L94 (PN 3945128210).

1. Possible Causes

PRESS SW-B HYD, FLT CTL [10CE1]
PRESS SW-G HYD, FLT CTL [10CE2]
PRESS SW-Y HYD, FLT CTL [10CE3]
SYSTEM-PRESS-SW [2151GN]
SYSTEM-PRESS-SW [1151GN]
SYSTEM-PRESS-SW [3151GN]
ROUTING BOX-DATA LOADING [102TD]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 27-92-00-810-821-B	Failure of the Blue Hydraulic Pressure Switch
TSM TASK 27-92-00-810-822-B	Failure of the Blue Hydraulic Pressure Switch
TSM TASK 27-92-00-810-824-B	Failure of the Green Hydraulic Pressure Switch
TSM TASK 27-92-00-810-825-B	Failure of the Green Hydraulic Pressure Switch
TSM TASK 27-92-00-810-827-A	Failure of the Yellow Hydraulic Pressure Switch
TSM TASK 27-92-00-810-828-A	Failure of the Yellow Hydraulic Pressure Switch
AMM 31-38-34-000-001	Removal of the Data Loading Routing Box (DLRB)
AMM 31-38-34-400-001	Installation of the Data Loading Routing Box (DLRB)
FOR [2CE1] (ELAC-1)
TSM TASK 27-93-00-810-896-A	Failure of ELAC1
FOR [2CE2] (ELAC-2)
TSM TASK 27-93-00-810-901-A	Failure of ELAC2

3. Fault Confirmation
Subtask 27-93-00-710-067-A

A. Test
Not applicable, the fault is evident.

4. Fault Isolation
Subtask 27-93-00-810-242-A

A. Do a check in the Post Leg Report to find a failure message related to the Flight Control Pressure Switch (10CE1/ 10CE2/ 10CE3/ 1151GN/ 2151GN/ 3151GN).
(1) If there is a failure message, do the trouble shooting procedure related to this failure message.
(2) If there is no failure message:
(a) Do the trouble shooting procedure related to the PRESS SW-B HYD, FLT CTL [10CE1] (Ref. TSM TASK 27-92-00-810-821).
(b) If the fault continues:

Do the trouble shooting procedure related to the PRESS SW-G HYD, FLT CTL [10CE2] (Ref. TSM TASK 27-92-00-810-824).

Do the trouble shooting procedure related to the PRESS SW-Y HYD, FLT CTL [10CE3] (Ref. TSM TASK 27-92-00-810-827).

(d) If the fault continues:

Do the trouble shooting procedure related to the SYSTEM-PRESS-SW [2151GN] (Ref. TSM TASK 27-92-00-810-822).

(e) If the fault continues:

Do the trouble shooting procedure related to the SYSTEM-PRESS-SW [1151GN] (Ref. TSM TASK 27-92-00-810-825).

(f) If the fault continues:

Do the trouble shooting procedure related to the SYSTEM-PRESS-SW [3151GN] (Ref. TSM TASK 27-92-00-810-828).

(g) If the fault continues:

Replace the ROUTING BOX-DATA LOADING [102TD] AMM 31-38-34-000-001 and AMM 31-38-34-400-001.

NOTE: This step is only applicable to ELACs L91/ L93/ L94 (PN 3945129101/ PN 3945129103/ PN 3945129104).

(h) If the fault continues:
Do the trouble shooting procedure:
1 FOR [2CE1] (ELAC-1)

(Ref. TSM TASK 27-93-00-810-896).

2 FOR [2CE2] (ELAC-2)

(Ref. TSM TASK 27-93-00-810-901).

[Rev.8 from Aug 2018] 2026.04.04 04:28:09 UTC