Joined: 11 Dec 2005
|Posted: Fri Dec 28, 2012 9:47 am Post subject: In-flight Assessment of Landing Performance
|JAR-OPS 1.400 Approach and Landing Conditions
"Before commencing an approach to land, the commander must satisfy himself that, according to the information available to him, the weather at the aerodrome and the condition of the runway intended to be used should not prevent a safe approach, landing or missed approach, having regard to the performance information contained in the Operations Manual."
Interpretation of safety by national authorities FAA and CAA is:
1) FAA: Landing Performance Assessments at Time of Arrival (SAFO 06012)
2) CAA: Operations on Contaminated Runways
Both authorities support in-flight application of safety margins.
(a)An operator shall ensure that the mass of the aeroplane:
(1) at the start of the take-off; or, in the event of in-flight replanning
(2) at the point from which the revised operational flight plan applies, is not greater than the mass at which the requirements of the appropriate subpart can be complied with for the flight to be undertaken, allowing for expected reductions in mass as the flight proceeds, and for such fuel jettisoning as is provided for in the particular requirement.
An operator shall ensure that the approved performance data contained in the aeroplane flight manual is used to determine compliance with the requirements of the appropriate subpart, supplemented as necessary with other data acceptable to the Authority as prescribed in the relevant subpart. When applying the factors prescribed in the appro- priate subpart, account may be taken of any operational factors already incorporated in the aeroplane flight manual performance data to avoid double application of factors.
When showing compliance with the requirements of the appropriate subpart, due account shall be taken of aeroplane configuration, environmental conditions and the operation of systems which have an adverse effect on performance.
For performance purposes, a damp runway, other than a grass runway, may be considered to be dry.
An operator shall take account of charting accuracy when assessing compliance with the take-off requirements of the applicable subpart.
Landing — dry runways
(a) An operator shall ensure that the landing mass of the aeroplane determined in accordance with OPS 1.475(a) for the estimated time of landing at the destination aerodrome and at any alternate aerodrome allows a full stop landing from 50 ft above the threshold:
(1) for turbo-jet powered aeroplanes, within 60% of the landing distance available; or
(2) for turbo-propeller powered aeroplanes, within 70% of the landing distance available;
Make sure that you have a good story for the Judge.