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737-300/400/500MAINTENANCE MANUAL
 ~............................................................................... | TROUBLE | PROBABLE CAUSE | ISOLATION PROCEDURE | REPAIR | ................................................................................. | | Digital air data | Do the air data system | Replace the| | | computer (DADC) | operational test | defective DADC| | | | (AMM 34-12-00/501 or | (AMM| | | | AMM 34-12-01/501). If | 34-12-11/401).| | | | DADC does not operate -| | | | | | | |Mach airspeed | Mach airspeed | Open MACH WARN SYS-1 (SYS | Replace the| |aural warning | aural warning | -2) circuit breaker P18 | defective aural| |clacker will | clacker | (P6). Remove connector | warning unit| |not sound | | D1172 (D940) from aural | module| |(cont) | | warning unit module.| | | | | Connect voltmeter across| | | | | pins 1 and 2 (11 and 10)| | | | | of connector. Close| | | | | circuit breaker. Push the| | | | | MACH AIRSPEED WARNING TEST| | | | | NO. 1 (NO. 2) switch,| | | | | voltmeter shall read 28| | | | | volts dc. If voltage is| | | | | present -| | | | | | | | | | | | | | | NOTE:____If voltage is not| | | | | present, isolate| | | | | malfunction to| | | | | either| | | | | mach/airspeed| | | | | indicator or| | | | | MACH AIRSPEED| | | | | WARNING TEST switch| | | | | | | | | MACH AIRSPEED | Open MACH WARN SYS-1 (SYS | Replace the| | | WARNING TEST | -2) circuit breaker on P18 | defective| | | switch | (P6) panel. Remove flight | flight| | | | recorder-mach airspeed | recorder-mach| | | | warning module from aft | airspeed| | | | overhead panel P5. | warning module| | | | Disconnect connector D483.| | | | | Connect ohmmeter across| | | | | pins 15 and 16 (4 and 6)| | | | | of flight recorder-mach| | | | | airspeed module. Push the| | | | | MACH AIRSPEED WARN TEST| | | | | NO. 1 (NO. 2) switch,| | | | | ohmmeter shall read| | | | | continuity. If ohmmeter| | | | | does not read continuity -| | | | | | |
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737-300/400/500MAINTENANCE MANUAL
 ~............................................................................... | TROUBLE | PROBABLE CAUSE | ISOLATION PROCEDURE | REPAIR | ................................................................................. |Mach airspeed | Mach/airspeed | Open MACH WARN SYS-1 (SYS | Replace the| |aural warning | indicator | -2) circuit breaker on P18 | defective mach/| |clacker sounds| | (P6). Remove flight | airspeed| |continuously | | recorder-mach airspeed | indicator| | | | warning module from aft | (AMM| | | | overhead panel P5. | 34-12-21/401).| | | | Disconnect connector D483.| | | | | Close circuit breaker.| | | | | If clacker sounds -| | | | | | | | | MACH AIRSPEED | Repeat above procedure. | Replace| | | WARNING TEST | If clacker does not sound -| defective| | | switch | | flight| | | | | recorder - mach| | | | | airspeed| | | | | warning| | | | | module| 2..............…..................…............................…................1
 4. Put the Airplane in its usual condition.
_______________________________________
 A. Remove electrical power if it is not necessary.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
 MACH AIRSPEED WARNING SYSTEM - ADJUSTMENT/TEST
______________________________________________
 1. General
_______
 A. This subject has this task:
 (1)  A system test.
 TASK 34-15-00-715-001
 2. Mach Airspeed Warning System Test
_________________________________
 A. Equipment
 (1)  
Air data test set, Druck ADTS405F, Druck Ltd. (Vendor Code 0R667), Leicester, England; or equivalent

 (2)  
Pitot-static probe adapter kit, P/N AD-953-7, Nav-Aids Ltd., Montreal, Canada; or equivalent

 (3)  
Static port test adapter assembly, P/N F72823-40, or equivalent

 (4)  
Flow restrictors, control valves, cutoff valves, and pressure tape as necessary.
　
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