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B.  The warning switch bellows is controlled by pitot and static pressure inputs and is mechanically connected to a set of contacts. When a predetermined airspeed or mach number is exceeded, the contacts open and 28 volts dc is removed from the switch relay. With the relay de-energized, a ground is applied to the clackers in the aural warning and call devices box. The clackers will remain energized until the airplane airspeed or mach number is reduced.
3.  Mach Airspeed Aural Warning Clackers
A.  The aural warning and call devices box on the control stand has two aural clackers. Upon initiation by the mach airspeed warning switch, the clackers provide a distinct warning signal which cannot be mistaken for the aural warnings associated with or activated by other systems (Ref Chapter 31-26-0, Aural Warning System).
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K39142 H23989
Mach/Airspeed Warning System Component Location  557 
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500  Mach/Airspeed Warning System Circuit 
Feb 15/68  Figure 2  34-15-0 
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MACH AIRSPEED WARNING SYSTEM - ADJUSTMENT/TEST
EFFECTIVITY
GJ ALL EXCEPT B-2509 thru B-2510 and B-2524
1.  Mach Airspeed Warning System Test
A.  Equipment and Materials
(1)  
Air pressure and vacuum source, 5-40 inches of mercury absolute, with adapters for connection to pitot and static sources on pitot static tube or to test fittings.

(2)  
Gage for measuring differential pressure accurate within 士 .010 inches of mercury with a range of at least 10 inches of mercury.

B.  Prepare to Test Mach Airspeed Warning System
(1)  
When applying pitot pressure, note following:

(a)  
Pitot static tube heaters should remain OFF during these tests.

(b)  
Pitot line pressure over static line pressure should not exceed 9 inches of mercury. Static line pressure must never exceed pitot line pressure.

 

(2)  
When applying static pressure, note following:

CAUTION:  CABIN ALTITUDE DIFFERENTIAL PRESSURE INDICATOR SHOULD BE DISCONNECTED FROM ITS STATIC PRESSURE SOURCE AND SOURCE SHOULD BE CAPPED.
(a)  
Static source selector valves should be in NORMAL position and should not be changed while vacuum is on static system.

(b)  
Do not apply pressure in excess of 31 inches of mercury absolute to static lines.

(c)  
Apply or release vacuum at a rate of climb or descent of approximately 3000 feet per minute or less between test points. At each test point pressure should be reduced slowly to desired level without overshoot.

(d)  
Seal static port on pitot static probe surface in such a way that removal of seal will be complete, leaving no deposits or roughness in or about static ports.

5C8
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(e)  
Apply pressure to system using pitot static probes by performing steps (f) through (h) or using system drain fittings by performing steps (i) thru (l).

(f)  
Connect vacuum source with adapter to No. 1 auxiliary static port on lower right pitot static probe.

(g)  
Seal No. 1 auxiliary static port on upper left pitot static probe.

(h)  
Connect positive pressure source with adapter to No. 1 auxiliary pitot port on lower right pitot static probe.

(i)  
Connect vacuum source with adapter to No. 4 drain fitting located on the right side E1 electronics rack.

(j)  
Seal No. 1 auxiliary static port on lower right and upper left pitot static probes.

(k)  
Connect positive pressure source with adapter to No. 3 drain fitting located on right side of E1 electronics rack.

(l)  
Seal No. 1 auxiliary pitot tube port on lower right pitot static probe.

(m)  
Connect differential pressure gage into pitot and static test lines.

(n)  
Disconnect cabin differential pressure indicator and cap static pressure tube.

C.  Test Mach Airspeed Warning Systems
WARNING:  WARNING DEVICE (CLACKER) SHOULD NOT BE ENERGIZED FOR MORE THAN 5 MINUTES OR DAMAGE MAY RESULT. ALLOW A MINIMUM COOLING PERIOD OF 15 MINUTES BEFORE ENERGIZING SYSTEM AGAIN.
(1)  
Close MACH WARN circuit breaker. Push MACH AIRSPEED WARNING TEST switch located on flight recorder and mach airspeed warning test module (P5 overhead panel). Clackers should come on.
　
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