Situations Where No‐Gyro or ASR Approach are Warranted
Lesson 4
Table 1 gives four different situations for when radar approach or no-gyro vectors may be warranted. Scenarios where these situations might occur are:
- ‘Normal’ vectors to intercept a published approach, with the aircraft flight display working properly.
- This is the typical, normal condition
- No‐gyro vectors to intercept a published approach, “without flight indications”. Navigation equipment and its display are still functioning. Possible scenarios:
- Attitude, Heading & Reference System (AHRS), or vacuum pump has failed
- Backup display is mounted in a location that is difficult to view
- Backup display fails
- Only the Magnetic compass for heading information and high workload
- ‘Normal’ vectors to, and execution of, an ASR approach when published electronic approach is not available and aircraft flight display is working. Possible scenario:
- Ground equipment or GPS for published electronic approach is not available;
- Failure of aircraft navigation equipment but flight display is working properly.
- Don’t have appropriate approach charts on board
- No‐gyro vectors to, and execution of, a no‐gyro approach when published electronic approach is not available and aircraft flight display is “without flight indications”. Possible scenarios:
- PFD and MFD have failed.
- Complete electrical failure
Table 1. Summary of the Different Situations for No-Gyro and ASR Approaches.
Aircraft Systems | Type of Approach | Where | "Normal" Radar Vectors | No-Gyro Vectors |
---|---|---|---|---|
All aircraft systems normal | Published approach | Any ASR facility | ||
"without primary flight indications" Course guidance still available | Published approach | Any ASR facility | | |
No course guidance available Flight Indications normal | ASR Radar approach | Only airport with published ASR approach | | |
No course guidance available and "without primary flight indications" | ASR Radar approach | Only airport with published ASR approach | |