MIL-STD-411F
5.3.2 Bail-out signal. The audio bail-out signal for use in troop carriers, cargo transport, and all other multicrew aircraft shall be a bell. The bell shall strike at a continuous rate of
5 ± 1 beats per second and shall be audible during flight to all aircrew members and passengers.
5.3.3 Wheels-up signal. When a nonverbal audio wheels-up signal is used, the signal shall be in accordance with MIL-S-9320 and shall have the following tone.
a. Frequency 250 ± 50 Hz.
b. Fundamental tone interrupted at 5 + 1 Hz. c. 50 ± 10 percent on-off cycle.
5.3.4 Audio angle of attack/airspeed/stall warning signal. When a nonverbal audio signal is used for presenting angle of attack/airspeed/stall warning information, referenced to a selected angle of attack/airspeed/stall speed, it shall be as specified in table I. The discrete position at which the chopped signal commences on either side of the "correct" signal will be readily adjustable.
TABLE I. Audio angle of attack/airspeed/stall warning signal.
ANGLE OF ATTACK |
AIRSPEED |
TONE SIGNAL |
Low |
Fast |
1,600 Hz tone interrupted at a rate of 1 to 10 Hz, the rate increasing linearly with decreasing angle of attack/increasing airspeed. |
Safe low |
Safe fast |
900 Hz steady tone, plus 1,600 Hz tone interrupted at a rate of zero to 1 Hz, the rate increasing linearly with decreasing angle of attack/increasing airspeed. |
Correct |
Correct |
900 Hz steady tone. |
Safe high |
Safe low |
900 Hz steady tone, plus 400 Hz tone interrupted at a rate of zero to 1 Hz, the rate increasing linearly with increasing angle of attack/decreasing airspeed. |
High |
Slow |
400 Hz tone interrupted at a rate of 1 to 10 Hz, the rate increasing linearly with increasing angle of attack/decreasing airspeed (stall warning). |
5.3.5 Nuclear radiation danger signal. When a nonverbal audio nuclear radiation danger signal is used, it shall consist of the following tones:
a. Square wave 500 ± 10 Hz b. Square wave 400 ± 10 Hz
The two tones shall be presented alternately, each being heard for 0.30 ± 0.05 seconds. The change from one tone to the other shall be accomplished in 0.02 seconds or faster. The output of the signal generator shall be such that the tones reaching the operator's ear shall have an overall sound pressure level of 95 ± 3 db.
5.3.6 Verbal audio warning signals. Verbal warning signals shall be audible signals in verbal form indicating the existence of a hazardous or imminent catastrophic condition requiring
14
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business