Centaurus
23rd Feb 2003, 06:56
Jepps (Air Traffic Control) - Flight Procedures -page 201- DOC 8168, has a table called Aircraft Approach Category. This is an ICAO table that indicates a specified range of handling speeds for each category of aircraft to perform the manoeuvres specified.
For a B737 (Category C) the range of speeds for initial approach is 160/240 (knots).
Question: Does this mean that until passing the final approach fix/point - (typically the outer marker on an ILS), a minimum IAS of 160 knots must be held in order to conform with the handling speeds in the table? Is this lower speed a limit and if so, why?
The problem arises where Boeing recommend a final approach stabilisation altitude in IMC of 1000 ft above runway level. Assuming an approach speed of 125 knots, then if using the 160 knots limit until passing the FAF - typically 4 miles (1300ft agl) - there appears to be a situation where the aircraft has to lose 35 knots in 300 feet in order to be stabilised by 1000 ft agl.
Request comment.
For a B737 (Category C) the range of speeds for initial approach is 160/240 (knots).
Question: Does this mean that until passing the final approach fix/point - (typically the outer marker on an ILS), a minimum IAS of 160 knots must be held in order to conform with the handling speeds in the table? Is this lower speed a limit and if so, why?
The problem arises where Boeing recommend a final approach stabilisation altitude in IMC of 1000 ft above runway level. Assuming an approach speed of 125 knots, then if using the 160 knots limit until passing the FAF - typically 4 miles (1300ft agl) - there appears to be a situation where the aircraft has to lose 35 knots in 300 feet in order to be stabilised by 1000 ft agl.
Request comment.