2016 PC Guide - HGS - Main5

Question 1

Does an inoperative RA affect approach minimums, if so how?

Answer 1

Approaches are not authorized below 4000 RVR or ¾ SM because the associated flight director will not be available. If the Captain’s radio altimeter is inoperative, the flight director will disappear at glideslope capture on an ILS approach.

Approaches below 4000 RVR or ¾ SM require both flight directors be operative and used for the approach.

Question 2

How does not having an RA affect the decision to divert to an alternate?

Answer 2

The weather at an alternate will be much more of a consideration since it will need to be at or above 4000 RVR or 3/4 mile.

Question 3

If the C/B associated with a failed radio altimeter was found to be out, should you consider a reset?

Answer 3

A reset should not be considered if the aircraft can safely be diverted to an alternate.

Per AOM Chapter 3 Limitations: The in-flight reset of a tripped circuit breaker should only be accomplished when directed by the QRH. Allow approximately two minutes for cooling before resetting.