Display of the Operational Message VMO/MMO..... 235/.60 on the Upper ECAM DU

TASK 34-13-00-810-912-A
Display of the Operational Message VMO/MMO..... 235/.60 on the Upper ECAM DU

1. Possible Causes

wiring of the L/G DOWN VMO/MMO SELECTION switch (22FP)
SW-L/G DOWN VMO/MMO SELECTION [22FP]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 05-51-17-200-001	Inspection after in Flight Excessive Load Factor due to Turbulence or Maneuver or in Excess of VMO/MMO
ASM 341302

3. Fault Confirmation
Subtask 34-13-00-710-132-A

A. Test
(1) Not applicable.

4. Fault Isolation
Subtask 34-13-00-810-161-A

A. If the message VMO/MMO..... 235/.60 is shown on the upper ECAM DU:

in the avionics compartment, on the relay plate 188VU, make sure that the L/G DOWN VMO/MMO SELECTION switch (22FP) is at NORM:

(1) If the switch is not at NORM:

set the switch to NORM.

(2) If the switch is at NORM:

do a check for a short to ground at the wiring of the L/G DOWN VMO/MMO SELECTION switch (22FP):
. pin A/3E to the ADIRU1 (1FP1) pin AA/3F
. pin A/3A to the ADIRU2 (1FP2) pin AA/3F
. pin A/3C to the ADIRU3 (1FP3) pin AA/3F. ASM 341302.

(a) If there is a short to ground:

repair the above wiring.

(b) If there is no short to ground:

replace the SW-L/G DOWN VMO/MMO SELECTION [22FP] .

(3) If the message "VMO/MMO.....235/.60" was shown on the Upper ECAM DU,and if the aircraft was in overspeed,do the Inspection after in Flight Excessive Load Factor due to Turbulence or Manoeuvre or in Excess of VMO/MMO. AMM 05-51-17-200-001.

[Rev.8 from Aug 2018] 2026.04.04 04:32:28 UTC