(Refer to Figure 249.) You are flying the RNAV(GPS) RWY 30 approach to LBF, over BEMXI, and you receive a RAIM error. You should

Question

BlackTom AI · Accepted Answer

Let's break down the scenario and the available information before evaluating options. The question describes flying the RNAV (GPS) RWY 30 approach to LBF and experiencing a RAIM error. RAIM failures affect the integrity of GPS navigation and typically require adherence to published abnormal or contingency procedures, such as continuing to the Missed Approach Point (MAP) and executing the missed approach if integrity cannot be assured.

Option provided: Continue to the missed approach point while climbing to 4,900 feet, and then execute the missed approach instructions.

Analysis:
- This option reflects the standard contingency action when GPS integrity is in doubt: proceed to the published MAP where the approach can be terminated if the navigation integrity is uncertain, and, upon reaching the MAP, initiate the missed approach if required by the procedure. The climb to 4,900 feet is a typical altitude change associated with the missed approach segment for this approach, ensuring obstacle clearance and proper sequencing for the MA.
- It aligns with the general aviation practice of not continuing beyond the MAP with uncertain navigation integrity, thereby ensuring a safe transition to the missed approach if ATC or the published procedure requires it.

Why this is appropriate in the context of a RAIM error:
- RAIM error compromises GPS position accuracy. If the procedure has a designated MAP and documented RAIM/BA (baro-aiding) contingencies, pilots are instructed to proceed to the MAP and then determine whether to execute the missed approach. In many RNAV (GPS) procedures, RAIM errors trigger a missed approach at the MAP if the pilot cannot insure reliable navigation.
- Climbing to 4,900 feet clears obstacles along the missed approach path and ensures that, if the MAP is reached and the MA is required, you can execute it promptly from a safe altitude.

Why there are not more options to compare:
- The provided data shows only one answer choice. Therefore, there is nothing to evaluate against within the given set. In a fully fleshed test, other options might include continuing to the mis sed approach point without climbing, or attempting to revert to alternate navigation, or exiting the procedure, but those alternatives are not present here.

In summary, the action described in the single option matches the expected RAIM contingency approach for an RNAV (GPS) procedure: proceed to the MAP at the published altitude, then execute the published missed approach if required, i.e., after reaching MAP and ensuring the safety constraints are met.

FA_221 Lesson 23 Quiz

(Refer to Figure 249.) You are flying the RNAV(GPS) RWY 30 approach to LBF, over BEMXI, and you receive a RAIM error. You should

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