Go around/Missed approach Acceleration speed

[M.85]

Dear All,

My airline doesnt have the acceleration altitude published in any manuals...
It doesnt make sense that if a missed approach is initiated at lets say 200ft AGL you typically start accelerating at 1000ft AGL..
Dont you have to have a specified altitude to accelerate for each airport...? would that be in the TO Special procedure for that particular runway?MSA?...

Thanks,

M.85

[square leg]

Accelerate at 1500 ft AAL. Easy as pie.

[M.85]

where did you get that info? out of your pocket?any JArs state that?
The 1000ft acc is just a training recommendation ..

M.85

[Bealzebub]

Isn't there somebody (training dept) at your airline you can ask ?

I am not sure what you mean by "missed approach acceleration speed" ? Do you mean missed approach acceleration altitude ?

It may well vary from airline to airline, but ours is 1000 ft above Decision altitude for the approach being used or higher if specified in the noise abatement procedures. This figure being used for both engines and single engine go arounds. If the missed approach track requires a turn prior to the 1000ft above D.A. then the turn should be completed prior to acceleration.

The missed approach profile is on the approach chart. Don't confuse missed approach procedures with emergency turn procedures, ( If that is what you mean by T/O special procedure). The latter is a company generated procedure and may well vary from company to company and might indeed be quite the opposite of the published missed approach procedure for a given runway !

If in doubt speak to your training department, that is what they are there for.

Good luck.

[OzExpat]

Pans Ops used to require an altitude for level acceleration in the missed approach. If memory serves me correctly, it provided a level segment length of 6 NM wherein you had at least 164 feet of obstacle clearance and, thereafter, required a 1% climb gradient. The minimum altitude for it was something like 820 feet but it might be higher, in order to meet the MOC requirement.

It was removed from Pans Ops back in 1993, or thereabouts, but I guess its possible that some countries retained it. There was no standard value for it, such as 1,000 feet or 1,500 feet above DH. I'd guess that this is something that each company's performance engineers work out.

[john_tullamarine]

.. not too critical if

(a) AEO and
(b) terrain is benign ...

but, otherwise ... beware .... and hassle your ops engineering group for some answers ..

[M.85]

thanks tullmarine..i was refering to Acceleration altitude...
No manuals from my department yet..im already fighting for so many other things..
1000ft above DH sounds reasonable but "screw"(sorry my french)about the noise abatement problem..
About the special procedure we have it in the runway analysis for T/0
Still not doing any intersection runway departures as we dont have the nrs in our runway analysis, neither wet runway nrs...

But thanks a lot for the info..

M>85

[Bally Heck]

My employers use 1000 feet. The SOP for going around is the same as the after take-off SOP. ie at 1000 ft AGL, "VNAV" or "Flight level change, plus eighty". Bear in mind that some states (The UK for example) specify that turns in the missed approach procedure should be flown at not greater than 185 knots.

[john_tullamarine]

M.85,

As was I.

... particularly if you are OEI, then the missed approach acceleration is every bit as important as for the takeoff case .. recall that the procedures designers don't give any thought to the OEI situation .. problem belonga pilot.

Similar considerations apply for AEO .. you still need to make sure that the acceleration doesn't compromise obstacle clearance. That is to say .. if the terrain is hostile, you need to know what went into the procedure design otherwise you are groping in the dark for a safe solution.

Of course, if you are conducting the missed approach over water or flat, featureless terrain .... not a problem ... and not all that common in the normal scheme of things ...

[Crossunder]

The absolute minimum accel. alt. is 400ft, but that's for take-off... I don't think there's a [specified] minimum accel. alt. for missed APCH - your MDA/DA must be calculated (acording to aircraft categosy and performance capabilities) so as to account for EF etc. in case of a missed APCH. A missed APCH below MDA/DA will never be stated on teh IAL charts, and you could be in deep shythe unless you've discussed a contingency procedure beforehand. You could decide to follow a SID/CLP and use the applicable accel. alts. of course...