Final answer:
The tolerances for a CAT II ILS at 100 ft. above DH are ±10 ft. in height and ±3 meters laterally.
Step-by-step explanation:
The tolerances for a CAT II Instrument Landing System (ILS) at 100 ft. above Decision Height (DH) are typically specified by aviation regulatory bodies. These tolerances ensure that the ILS provides accurate guidance for pilots during approach and landing.
For a CAT II ILS, the height tolerance is generally within ±10 ft., meaning that the aircraft can be up to 10 ft. above or below the specified altitude of 100 ft. above DH. This ensures that the aircraft maintains a safe altitude during the approach.
Additionally, the lateral tolerance for a CAT II ILS is usually within ±3 meters (10 feet), meaning that the aircraft should stay within a 6-meter (20-foot) wide corridor centered on the runway centerline. This horizontal tolerance ensures that the aircraft stays on the centerline and remains aligned with the runway during the approach.