Situational Awarelessness
Frank Bowlin may have a misunderstanding of how the CDI needle works while the HSI is using LOC signals.
Readback: December 2012
Frank Bowlin may have a misunderstanding of how the CDI needle works while the HSI is using LOC signals.
Key Takeaways:
- An incorrect HSI course setting on a localizer approach, while not affecting the raw CDI needle deflection, can severely confuse a pilot's situational awareness and lead to misinterpretations of their position relative to the course.
- The "T" notation on approach charts refers to notes about obstacles in the A/FD, and Obstacle Departure Procedures (ODPs) are only required when obstacles penetrate the 40:1 obstruction clearance surface, not for low, close-in obstacles under 200 feet.
- Localizer courses can be intentionally offset from the runway centerline; for ILS procedures, offsets up to 3.00 degrees are charted, while greater offsets for approaches without vertical guidance are classified as Localizer-type Directional Aids (LDAs), potentially for straight-in or circling only depending on the offset degree.
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