HalinTexas
昇る太陽の土&#
- Joined
- Feb 14, 2004
- Posts
- 1,536
FAR 25.841 (b)(6) Warning indication at the pilot or flight engineer station to indicate when the safe or preset pressure differential and cabin pressure altitude limits are exceeded. Appropriate warning markings on the cabin pressure differential indicator meet the warning requirement for pressure differential limits and an aural or visual signal (in addition to cabin altitude indicating means) meets the warning requirement for cabin pressure altitude limits if it warns the flight crew when the cabin pressure altitude exceeds 10,000 feet.
One of the problems of the certification process is each FSDO has their own interpretation of the FAR's. The airplane I fly has a nice lady saying "CABIN, CABIN..." if you you exceed 10,000 ft CA. This airplane appears to have a horn that can be confused with other system malfunctions. Dumb.
Older Boeing designs use an intermittent horn. Same sound for T/O config.