How soon after take-off can one engage the autopilot

[Slasher]

To reply to the threads initial question,

B737-300:

Boeing:

* At 1000 ft AGL until 50 ft radar-alt at the destination/alternate airfield (single AP).

Company:

* Any time after aircraft is established in enroute climb or cruise and all checklists are completed, until -
i) published minimum
ii) 500 ft AGL for unpublished approaches but served by a destination nav-aid suitable for center-line tracking
iii)500 ft AGL (day) and 1000 ft AGL (night) for approaches with nil electronic approach aids
iv) At the circling minima whilst manouvering at certain Company airports (due close-proximity of high terrain)

at the destination/alternate airfield.

* Notwithstanding the above, at any time the PIC deems its use necessary in the interests of safety, crew workload or expedition.

Usual on-line practice:

AP in -

1. TOPC if climb uneventful and/or a low-level crz alt

2. During enroute climb if workload high or where feelin particularly lazey!

AP out-

1. TOPD if descent/approach anticipated to be uneventful with low/medium-workload

2. Co minimum as mentioned above if where feelin a little bit bloodey fragile that day!