A320 ADR 2 Mel ops procedure.

[oskar]

Hi guys.
Would be grateful for any feedback. When you have ADR 2 Mel and it directs you to operational procedure. The procedure informs crew to pull cb. Please could you explain if you pull vac 26 and aoa cb or do you need only pull one cb of n8 or n9. It looks a little confusing. Any information is appreciated.

Regards

Oskar

[AKAAB]

I'm not sure what you have in your MEL, but the Airbus A320 MMEL has this in the (O) procedures.

It looks like two breakers, but in fact it is only one and includes both the ADIRU and AOA. Depending on your specific aircraft, the c/b can be in either position indicated.

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DURING COCKPIT PREPARATION
‐ ADR 2 pb-sw.......................................................... ...................OFF
The F/CTL MAINTENANCE message is displayed on the STATUS SD page.
‐ AIR DATA SWITCHING selector...............................................F/O 3
‐ ADIRS/ADIRU/2/26VAC AND AOA (location 121VU N08 or N09) C/B................................... Pull
AFTER ENGINE START
‐ Use the RCL pb-sw on the ECAM control panel, in order to recall the NAV ADR 2 FAULT alert.
‐ On the EWD, check that the ADR 2...OFF procedure is not displayed.

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[PT6A]

34-10-02B ADR 2 Ident.: MO-34-10-00008928.0003001 / 17 SEP 10 Applicable to: ALL

FLIGHT PREPARATION/LIMITATIONS Maximum landing capability is CAT 3 SINGLE. DURING COCKPIT PREPARATION ‐ ADR 2 pb-sw.......................................................... ............................................................ .....OFF The F/CTL MAINTENANCE message is displayed on the STATUS SD page. ‐ AIR DATA SWITCHING selector.................................................... ......................................F/O 3 ‐ ADIRS/ADIRU/2/26VAC AND AOA (location 121VU N08 or N09) C/B...................................Pull AFTER ENGINE START ‐ Use the RCL pb-sw on the ECAM control panel, in order to recall the NAV ADR 2 FAULT alert. ‐ On the EWD, check that the ADR 2...OFF procedure is not displayed. FOR TAKEOFF Takeoff in CONF 1+F is not permitted. Note: When the ADR 2 pb-sw is set to OFF, and if the aircraft is in CONF 1+F, the SFCS n°2 Flap channel is unable to crosscheck the airspeed coming from the ADR 1 with the ADR 2 airspeed coming from the SFCS n°2 Slat channel. This may lead to an uncommanded flap retraction during the takeoff. As a consequence, takeoff in CONF 1+F is not permitted when the ADR 2 pb-sw is set to OFF.