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Check the altimeter at the outer marker. Middle Marker

Outer Marker

LLZ Transmitter

GP GP Transmitter

A SECOND OPINION ON THE GLIDE PATH. When you consider the very low DA which applies to the ILS, it is clear that there is little room for error. Even if the pilot LLZ has exceptional skill, he/she cannot be expected to maintain the correct glide path if the instrument indications are incorrect. Since the ILS glide path is fixed at 3°, any particular distance from the touch-down point must represent a particular height. During the approach it is necessary to cross check the altimeter reading against published reference heights at various distances from the touch-down point.

If the glide path deviation indicator showed that you were on the glide path shown above, your altimeter should read 1230 ft at 6 DME [the outer marker]. This point is indicated by a Maltese Cross and is called the Final Approach Point [FAP] for an ILS approach and the Final Approach Fix [FAF] for a non precision approach. If the check shows an unexplained discrepancy, for example the altimeter reads 1290 feet while the glide path deviation indicator is centered, the ILS approach should be discontinued. This does not necessarily mean that you must commence a missed approach - you can simply continue with the LLZ procedure and use the LLZ minima instead of the DA. During the ILS approach, you are assured of obstacle clearance if you remain within half scale deflection of the indicators. If at any time full scale deflection is noticed, a missed approach must be commenced. AIP ENR 1.5 para 7.3.1 [a], [b], [c].
ALL RIGHTS RESERVED © 2001

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