W DOC AIRBUS | AMM A320F

Operational Check of the Back Up Speed Scale Display

TASK 34-13-00-710-009-A
Operational Check of the Back Up Speed Scale Display

ZONE: 210
1. Reason for the Job
Refer to the MPD TASK: 341300-09
OPERATIONAL CHECK OF THE BACK UP SPEED SCALE DISPLAY
2. Job Set-up Information
 A. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
210
CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
 B. Referenced Information
REFERENCE
DESIGNATION
TASK 24-41-00-861-002-A
Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01
Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02
Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A
De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01
De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02
De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 31-60-00-860-001-A
EIS Start Procedure
TASK 31-60-00-860-002-A
EIS Stop Procedure
TASK 34-10-00-860-004-A
Inertial Reference (IR) Alignment-Procedure
TASK 34-10-00-860-004-A-01
Automatic Inertial Reference (IR) Alignment-Procedure
TASK 34-10-00-860-004-A-02
Inertial Reference (IR) Alignment-Procedure to do a Check of the Links between each Flight Management and Guidance Computer (FMGC) and the three Air Data/Inertial Reference Units (ADIRUs)
TASK 34-10-00-860-005-A
ADIRS Stop Procedure
F Display of the Back-Up Speed and Altitude Scales ** ON A/C NOT FOR ALL
F Display of the Back-Up Speed and Altitude Scales ** ON A/C NOT FOR ALL
3. Job Set-up
Subtask 34-13-00-860-104-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
   (1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
   (2) Do the EIS start procedure (PFD DUs only) (Ref. AMM TASK 31-60-00-860-001).
   (3) Do the IR alignment procedure (Ref. AMM TASK 34-10-00-860-004).
Subtask 34-13-00-875-061-A ** ON A/C NOT FOR ALL
B. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUNAV PROBES/ADIRU 1/AND AOA 1/26VAC5FP1F07
49VUNAV PROBES/ADIRU1/115VAC4FP1F06
121VUADIRS/ADIRU/2/26VAC AND AOA5FP2N08
121VUADIRS/ADIRU/3/26VAC AND AOA5FP3N07
121VUADIRS/ADIRU/2/115VAC4FP2N06
121VUADIRS/ADIRU/3/115VAC4FP3N05
4. Procedure
Subtask 34-13-00-710-063-B ** ON A/C NOT FOR ALL
A. Operational Test of the Back-Up Speed and Altitude Scales
NOTE: The display of the back-up speed and altitude scales is related to the position and sensitivity of the AOA sensors. The result must be included between the FAST and SLOW indications.
F Display of the Back-Up Speed and Altitude Scales ** ON A/C NOT FOR ALL
NOTE: If you do this test in a hangar, it is possible that the GPS data will be incorrect. Thus, the "ALT" flag will be shown on the PFD altitude scale and not on the GPS altitude scale.
ACTION
RESULT
1.On ADIRS MSU panel 41VU:
  • Make sure that ADR1, ADR2 and ADR3 pushbutton switches are pushed.
On ADIRS MSU panel 41VU:
  • The FAULT and OFF legends of the pushbutton switches are off.

On the CAPT and F/O PFDs:
  • The speed and altitude scales from ADR1 and ADR2 are shown.
2.On ADIRS MSU panel 41VU:
  • Push ADR1 pushbutton switch.
On ADIRS MSU panel 41VU:
  • The OFF legend of ADR1 pushbutton switch comes on.

On the CAPT PFD:
  • The air data parameters go out of view.
3.On the center pedestal, on the SWITCHING panel 8VU:
On the CAPT PFD:
  • Set the AIR DATA selector switch to CAPT/3.
  • The air data parameters come into view again.
4.On ADIRS MSU panel 41VU:
On ADIRS MSU panel 41VU:
  • Push ADR2 pushbutton switch.
  • The OFF legend of ADR2 pushbutton switch comes on.

On the F/O PFD:
  • The air data parameters go out of view.
5.On ADIRS MSU panel 41VU:
On ADIRS MSU panel 41VU:
  • Push ADR3 pushbutton switch.
  • The OFF legend of ADR3 pushbutton switch comes on.

On the CAPT and F/O PFDs:
  • The back-up speed scale is shown (the green/amber/red band replaces the airspeed indication)
  • The GPS ALT indication is shown below the altitude scale
  • The GPS altitude value is shown on the right side of the altitude scale with the two last digits dashed.
6.On the center pedestal, on the SWITCHING panel 8VU:

  • Set the AIR DATA selector switch to NORM.

7.On ADIRS MSU panel 41VU:
On ADIRS MSU panel 41VU:
  • Push again ADR1, ADR2 and ADR3 pushbutton switches.
  • The OFF legends of ADR1, ADR2 and ADR3 pushbutton switches go off.

On the CAPT and F/O PFDs, the speed and altitude scales go back to the usual display.
Subtask 34-13-00-710-063-D ** ON A/C NOT FOR ALL
A. Operational Test of the Back-Up Speed and Altitude Scales
F Display of the Back-Up Speed and Altitude Scales ** ON A/C NOT FOR ALL
NOTE: The display of the back-up speed and altitude scales is related to the position and sensitivity of the AOA sensors. The data is shown between the FAST and SLOW indications.
NOTE: If you do this test in a hangar, it is possible that the GPS data will be incorrect. Thus, the "ALT" flag will be shown on the PFD altitude scale and not on the GPS altitude scale.
ACTION
RESULT
1.On instrument panel 301VU (500VU):
  • Push the BKUP SPD/ALT pushbutton switch.
On instrument panel 301VU (500VU):
  • The ON legend of the BKUP SPD/ALT pushbutton switch comes on.
On the CAPT (F/O) PFD:
  • The speed scale will change to Back-Up Speed Scale (BUSS).
  • The altitude scale will change to the GPS altitude scale.
2.On instrument panel 301VU (500VU):
  • Push again the BKUP SPD/ALT pushbutton switch.
On instrument panel 301VU (500VU):
  • The ON legend of the BKUP SPD/ALT pushbutton switch goes off.
On the CAPT (F/O) PFD:
  • The speed and altitude scales go back to the usual display.
Subtask 34-13-00-710-063-F ** ON A/C NOT FOR ALL
A. Operational Test of the Back-Up Speed and Altitude Scales
NOTE: The display of the back-up speed and altitude scales are in relation with the position and sensitivity of the Angle Of Attack (AOA) sensors. The result must be between the FAST and SLOW indications.
F Display of the Back-Up Speed and Altitude Scales ** ON A/C NOT FOR ALL
NOTE: If you do this test in a hangar, it is possible that the GPS data will be incorrect. Thus, the "ALT" flag will come into view on the PFD altitude scale and not on the GPS altitude scale.
ACTION
RESULT
1.On ADIRS MSU panel 41VU:
  • Make sure that ADR1, ADR2 and ADR3 pushbutton switches are pushed.
On ADIRS MSU panel 41VU:
  • The FAULT and OFF legends of these pushbutton switches are off.

On the CAPT and F/O PFDs:
  • The speed and altitude scales from ADR1 and ADR2 come into view.
2.On ADIRS MSU panel 41VU:
  • Push ADR1 pushbutton switch.
On ADIRS MSU panel 41VU:
  • The OFF legend of ADR1 pushbutton switch comes into view.

On the CAPT PFD:
  • The air data parameters go out of view.
3.On the center pedestal, on SWITCHING panel 8VU:
On the CAPT PFD:
  • Set the AIR DATA selector switch to CAPT/3.
  • The air data parameters come into view again.
4.On ADIRS MSU panel 41VU:
On ADIRS MSU panel 41VU:
  • Push ADR2 pushbutton switch.
  • The OFF legend of ADR2 pushbutton switch comes into view.

On the F/O PFD:
  • The air data parameters go out of view.
5.On ADIRS MSU panel 41VU:
On ADIRS MSU panel 41VU:
  • Push ADR3 pushbutton switch.
  • The OFF legend of ADR3 pushbutton switch comes into view.

On the CAPT and F/O PFDs:
  • The back-up speed scale comes into view (the green/amber/red band shows at the location of the airspeed indication).
  • The GPS ALT indication comes into view below the altitude scale.
  • The GPS altitude value comes into view on the right side of the altitude scale with the last two digits dashed (optional).
6.On the center pedestal, on SWITCHING panel 8VU:

  • Set the AIR DATA selector switch to NORM.

7.On ADIRS MSU panel 41VU:
On ADIRS MSU panel 41VU:
  • Push again ADR1, ADR2 and ADR3 pushbutton switches.
  • The OFF legends of ADR1, ADR2 and ADR3 pushbutton switches go off.

On the CAPT and F/O PFDs:
  • The speed and altitude scales go back to the usual display.
Subtask 34-13-00-710-063-H ** ON A/C NOT FOR ALL
A. Operational Test of the Back-Up Speed and Altitude Scales
NOTE: The display of the back-up speed and altitude scales are in relation with the position and sensitivity of the Angle Of Attack (AOA) sensors.
NOTE: If you do this test in a hangar, it is possible that the GPS data will be incorrect. Thus, the "ALT" flag will come into view on the PFD altitude scale and not on the GPS altitude scale.
ACTION
RESULT
1.On instrument panel 301VU:
  • Push the CAPT BKUP SPD/ALT pushbutton switch.
On instrument panel 301VU:
  • The ON legend of the BKUP SPD/ALT pushbutton switch comes on.
On the CAPT PFD:
  • The speed scale changes to the SPD red flag indication (no Back-Up Speed Scale (BUSS)).
  • The altitude scale changes to the GPS altitude scale.
On the upper ECAM DU:
  • Amber memo BKUP SPD/ALT comes into view.
2.On instrument panel 500VU:
  • Push the F/O BKUP SPD/ALT pushbutton switch.
On instrument panel 500VU:
  • The ON legend of the BKUP SPD/ALT pushbutton switch comes on.
On the F/O PFD:
  • The speed scale changes to the SPD red flag indication (no BUSS).
  • The altitude scale changes to the GPS altitude scale.
On the upper ECAM DU:
  • Amber memo BKUP SPD/ALT comes into view.
  • Caution NAV BKUP SPD/ALT ON CAPT+F/O PFD comes into view.
3.On instrument panels 301VU and 500VU:
  • Push again the BKUP SPD/ALT pushbutton switches.
On instrument panels 301VU and 500VU:
  • The ON legend of the BKUP SPD/ALT pushbutton switch goes off.
On the CAPT (F/O) PFD:
  • The speed and altitude scales go back to the usual display.
On the upper ECAM DU:
  • Amber memo BKUP SPD/ALT goes out of view.
  • Caution NAV BKUP SPD/ALT ON CAPT+F/O PFD goes out of view.
5. Close-up
Subtask 34-13-00-860-105-A ** ON A/C NOT FOR ALL
A. Put the aircraft back to its initial configuration.
   (1) Do the ADIRS stop procedure (Ref. AMM TASK 34-10-00-860-005).
   (2) Do the EIS stop procedure (Ref. AMM TASK 31-60-00-860-002).
   (3) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
[Rev.10 from 2021] 2026.04.01 08:26:44 UTC
"Aviabrain" 2025