When should we go missed on an ILS approach?

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BlackTom AI · Accepted Answer

The question asks about the appropriate point to execute a missed approach on an ILS (Instrument Landing System) approach. 
Option 1: 'Upon arrival at the Decision Altitude' — This aligns with standard instrument approach procedures for precision approaches. On an ILS, you must decide to continue visually or initiate a missed approach at the decision altitude/height (DA/DH) when the required visual references are not in sight or the landing criteria are not met. If you have the required runway environment and visual cues before reaching DA, you may continue visually, but the formal trigger is theDA/DH itself. 
Option 2: 'At the Missed Approach Point' — For precision approaches like an ILS, the Missed Approach Point concept is not the primary trigger. The MAP is more associated with non-precision approaches, or with certain procedures that specify a fixed MAP distance. In an ILS, the decision point is the DA/DH, not a separate MAP offset. Therefore this choice does not reflect the standard trigger for a Missed Approach on an ILS. 
Option 3: 'When advised by Tower' — While ATC can provide guidance or instruction, the technical requirement to initiate the missed approach is not contingent on a Tower instruction. Pilots must initiate the missed approach whenever the criteria at DA/DH are not satisfied, independent of explicit tower advice. Waiting for a tower instruction could lead to an unsafe situation if the runway environment is not in sight or the required criteria are not met. 
In summary, the core concept is that a precision approach like the ILS relies on a decision altitude/height as the formal point to decide whether to continue the approach visually or go around. The other options misstate the trigger by either misplacing the missed-approach decision point or relying on external instruction as the sole trigger.

AS 221 AS 221 - Exam 3- Requires Respondus LockDown Browser

When should we go missed on an ILS approach?

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