← All explained questions · Supplemental · III — Airport & Seaplane Base Operations
An ILS (Instrument Landing System) Critical Area protected during low visibility ("CAT II/III ops") is
Choices
always protected.
Critical area is protected only in low-vis ops.
✓ protected only when ATC declares the airport in low-visibility conditions.correct
ATC will instruct aircraft to hold clear of the ILS critical area to prevent multipath signal interference. Pilots must comply with hold-short instructions for these areas. ILS Critical Area: protected during CAT I/II/III approaches in low-visibility conditions to prevent vehicles or aircraft from interfering with the ILS signal. ATC declares 'CAT II/III ops in effect' and applies stricter taxi separation. Pilot may receive 'hold short of ILS critical area' instructions; comply as for any hold-short. Markings (yellow ladder pattern) and signs identify the boundaries.
marked with red and white striped barriers.
Marked with yellow ladder pattern, not red/white.
the area used for taxi only.
Critical area protects ILS signal, not for taxi.
Why
ATC will instruct aircraft to hold clear of the ILS critical area to prevent multipath signal interference. Pilots must comply with hold-short instructions for these areas. ILS Critical Area: protected during CAT I/II/III approaches in low-visibility conditions to prevent vehicles or aircraft from interfering with the ILS signal. ATC declares 'CAT II/III ops in effect' and applies stricter taxi separation. Pilot may receive 'hold short of ILS critical area' instructions; comply as for any hold-short. Markings (yellow ladder pattern) and signs identify the boundaries.
FAA source: AIM 1-1-9, FAA Order 7110.65; AIM 1-1-9 Instrument Landing Systembrowse the reference library →
Original study question written for this course — representative of FAA knowledge-test topics, not an actual current FAA exam question.