When do we disarm the A/T?

[emerydc8]

I have never heard of the autothrottle being physically armed on entering the runway. This is not Boeing SOP.

Maybe it's a U.S. thing. I've never heard of not arming and disarming the A/T switch when entering the runway and just after exiting the landing runway.


BEFORE TAKEOFF
(PNF)
AUTOTHROTTLES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ARM
* ALTIMETERS. . . . . . . . . . . . . . . . ____ IN (HPA) ____ FT / SET
__________________________________________________________________
AFTER LANDING
(PNF - Silent)
SPEEDBRAKES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .DOWN
STROBE LIGHTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .OFF
AUTOBRAKES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .OFF
FLAPS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . UP
STABILIZER TRIM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 UNITS
EFIS WXR / TERR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .OFF
FLIGHT DIRECTORS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .OFF
AUTOTHROTTLE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .OFF
NACELLE ANTI-ICE. . . . . . . . . . . . . . . . . . . . . . AS REQUIRED
APU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AS REQUIRED

[Hardy Heinlin]

Is this a to-do-list or a check-list?

[emerydc8]

This is the checklist. It is done using a flow and then backed up with the checklist. The after landing items are not read out loud.

[Will]

So that means the flow could be accomplished much earlier, and just double-checked as the aircraft enters the runway?

[emerydc8]

No. To say that it could have been done at the gate is a bit of a stretch.  I can't copy and paste our checklist, but Polar's is virtually the same.

Before Takeoff Procedure - PNF
Complete the following procedure and checklist when approaching the departure
end of the runway and prior to entering the active runway.
AUTOTHROTTLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ARM
____________________________________________________________
Taxi-In Procedure - PNF (Silent)
When clear of the active runway and conditions permit, the PF will command,
"AFTER LANDING":
SPEEDBRAKES (CA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DOWN
Manually stow speedbrakes.
Landing and runway turnoff lights switches (CA)................................As required
STROBE lights (CA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF
AUTOBRAKES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF
FLAPS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . UP
Retract the flaps and observe EICAS indications to verify retraction.
Note: Do not retract the flaps if a malfunction has occurred, a hard
landing is suspected, or the runway, taxiways, and/or ramps are
contaminated with snow, ice, or slush.
Note: To avoid a security alert, advise the controller if you will be taxiing
to the parking spot with the flaps not fully retracted.
STABILIZER TRIM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 UNITS
Positions stabilizer to neutral fuselage markings.
EFIS WXR and TERR switches. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF
Ensure both EFIS control panel WXR and TERR switches OFF.
FLIGHT DIRECTOR switches. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF
AUTOTHROTTLE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF
NACELLE ANTI-ICE switches. . . . . . . . . . . . . . . . . . . . . . . . . AS REQUIRED
APU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AS REQUIRED
Confirm with the Captain before starting the APU.
Comply with APU use policy, refer to NP.10.
Note: Position APU selector back to ON position. Do not allow APU
selector to spring back to ON position.
"AFTER LANDING checklist complete."

[Hardy Heinlin]

In Lufthansa, for example, there is no A/T disarm task after landing, not even after parking. However, there is an A/T disarm task during cockpit preparation and an A/T arm task shortly before the takeoff checklist is performed. Both tasks are done by the F/O.

[emerydc8]

According to my FCOM, on an autoland and reverse, even though the A/T goes off, it looks like it is re-armed again (10 seconds after coming out of reverse) until the flaps are up. So maybe the A/T system is disabled on the ground with flaps up.

During rollout, autothrottle IDLE mode remains active until the autothrottle disconnects with the thrust levers in reverse.

NOTE: Ten seconds after reverse thrust levers are down, autothrottle is armed until flaps are UP. Pushing a TO/GA switch while the autothrottle is armed activates the autothrottle in THR REF mode.

https://drive.google.com/file/d/0B-WRh0Hf7VdZZzRITzdKVF9QVWM/view?usp=sharing

[Avi]

I have 2 AOMs.
In one of them the captain should check the A/T switch is ARM during his preflight checks and it never switched OFF after landing and in the other AOM it is done (arming) before takeoff and switched to OFF during taxi-in.

This is 100% company policy.

Cheers,