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Go around climb gradient

Old 9th Oct 2020, 20:07
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Go around climb gradient

Hi can some body Tell. Me what are requrements regarding go around minima to choose regardit gradient. I am asking regarding twin jet. Which minima should. I choose
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Old 9th Oct 2020, 21:04
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If in doubt, use the highest published minima (typically based on, if I remember correctly, a 2.5% approach climb gradient, one engine inoperative). If you can ascertain better than standard (missed) approach climb gradient to the required altitude including gradient loss for any required turns, then use the corresponding lower approach minima.
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Old 9th Oct 2020, 23:00
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PANS-OPS state a nominal climb gradient of 2.5%. It can be higher than that for obstacle clearance or airspace structure. Which to pick? Whatever your performance calculations say.
On our Boeing OPT we can select what MACG to base the calculation on when more than one is published. If we don't make it, we take the higher minina.

EDIT
I don't recall PANS-OPS 2,5% MACG considering the engine out scenario. Too many variables, and like for engine failure procedures after take off, operators have to verify their performance capabilities and establish contingency procedures.

Last edited by Banana Joe; 9th Oct 2020 at 23:20.
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Old 10th Oct 2020, 00:43
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2.5% is standard minima (other options might be available and you might need more than 2.5% eg INN). It must be satisfied until reaching a specifically published acceleration altitude or 1500ft which is the standard ACCEL ALT.

It's calculated OEI, Go-Around flap config, L/G Up and one engine at TOGA.
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Old 10th Oct 2020, 06:02
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Ok So it should be 2.5 % which is required by certufication of the aircraft to be Able to make it?
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Old 10th Oct 2020, 08:35
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Originally Posted by Banana Joe View Post
I don't recall PANS-OPS 2,5% MACG considering the engine out scenario. Too many variables, and like for engine failure procedures after take off, operators have to verify their performance capabilities and establish contingency procedures.
It does consider it. There is a note, however, stating that some aircraft might have problems achieving 2.5% at weights close to MTOW, but this is more problem at heavies where MTOW >> MLW:

6.1.7.3 Special conditions. It is emphasized that a missed approach procedure which is based on the nominal
climb gradient of 2.5 per cent cannot be used by all aeroplanes when operating at or near maximum certificated gross
mass and engine-out conditions. The operation of aeroplanes under these conditions needs special consideration at
aerodromes which are critical due to obstacles on the missed approach area. This may result in a special procedure
being established with a possible increase in the DA/H or MDA/H.
Just food for thought, if it didn't consider OEI scenario: which transport category aircraft in use today can't achieve 5% or even greater MACG in go-around configuration with two (all) engines at TOGA?

Last edited by FlyingStone; 10th Oct 2020 at 08:45.
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