Hi,
Our OPS manual permits the use of Speed brake & Flaps - if it's necessary in order to be stable in a timely manner. The FCTM contains the following health warning:
"In certain circumstances, e.g. tail wind or high weight, the deceleration rate may be insufficient. In this case, the landing gear may be lowered, preferably below 220 kt (to avoid gear doors overstress), and before selection of Flap 2. Speedbrakes can also be used to increase the deceleration rate but the crew should be aware of:
• The increase in VLS with the use of speedbrakes
• The limited effect at low speeds
• The speed brake auto-retraction when selecting the landing configuration. (Not applicable for A318)"
I've not noticed any unwanted roll, but gentle control of the speed brake is advised to avoid rapid pitch changes. On some types the auto thrust needs to be reset as it may hold 10 kts faster than commanded.
Last edited by rudderrudderrat; 16th Oct 2010 at 18:46.
Reason: typo