(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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BlackTom AI · Accepted Answer

The scenario describes an RNAV (GPS) RWY 30 approach with RAIM (GPS integrity) error occurring while en route to the missed approach point (MAP). In this situation, the safe and procedure-compliant action is guided by recognizing that RNAV with GPS integrity loss typically requires adhering to the missed approach as soon as the MAP is reached, with the climb to the missed altitude to ensure obstacle clearance and re-tracking capability.
Option A says: Continue the approach, but descend no lower than the circling minimums. This would imply descending below published minimums while RAIM integrity is in question, which is unsafe because you cannot reliably ensure obstacle clearance without GPS integrity. Therefore, this choice is incorrect because it permits descent below minimums in a scenario where NAV integrity is compromised.
Option B says: Continue to the missed approach point while climbing to 4,900 feet, and then execute the missed approach instructions. This aligns with standard practice for RAIM loss on certain RNAV approaches: proceed to the MAP while initiating the climb to the published missed altitude, then execute the missed approach if the navigation guidance is unreliable. The 4,900 feet target is the published missed altitude in the chart profile, and climbing while maintaining the MAP ensures you reach a safe altitude before performing the missed procedure.
Option C says: Continue to published minimums, but complete the approach in 2 minutes or less. This is not a recognized safety or timing cue for RAIM issues; time-to-complete criteria do not replace navigation integrity requirements. Rushing to a minimum or trying to complete within a time constraint does not address the NAV integrity problem and could lead to an unsafe decision, making this option incorrect.
In summary, the logic hinges on maintaining navigation integrity and ascending to the published missed altitude while at the MAP, then performing the missed approach as required. The other options either lower the minimums during an integrity issue or rely on an unsupported time-based criterion, which are inappropriate in the RAIM failure context.

FA_221 Lesson 37 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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