airsnoop
9th Jun 2011, 06:35
Although I have flown some of them my recall is confused. Did the following older types have an amber/red caution light for cabin alt above 10K ft as well as an audio?
Types: DC9/DC10/B707/Cessna Citation/BAC1-11
Ta for your help.
Tmbstory
9th Jun 2011, 07:26
airsnoop:
The Citation three had the following warning systems for cabin pressure.
"A barometric pressure switch causes the CABIN ALT 8500 FT annunciator to illuminate if the cabin altitude rises above approximately 8500 feet. A dual barometric switch system activates an aural warning if the cabin altitude rises above approximately 10,000 feet. The aural warning (horn) can be silenced with a MUTE / TEST button near the dump switch. the system has dual barometric switches, audible warning units and speakers. The two systems are separately wired to the remote audio amplifier where the signals are mixed to provide redundancy in both pilot's speakers and headphones.
On the ground, the MUTE / TEST button is used to test the cabin altitude warning system horns. When the squat switches go to air mode, this test function is disabled and the button is only used to silence the horns."
Tmb