(8)  
On pilots overhead panel P5, momentarily hold MACH A/S WARNING test switch at TEST or NORM.

 (9)  
Observe that as long as test switch is held at TEST or NORM, a clacking sound (interrupted at approximately 7-Hz) is heard from flight engineer's station.

 (10)
 On airplanes with supplementary fuel tanks, momentarily hold MACH A/S WARNING test switch on overhead panel to RES (AUX) FUEL. Observe that a clacking sound is heard for as long as the test switch is held at RES (AUX) FUEL.

 (11)
 Set mach airspeed-gear down airspeed selector switch to GEAR DOWN DISPATCH position and repeat steps (8) and (9).

 (12)
 Return selector switch to NORMAL VMO position.

 (13)
 Remove electrical power if no longer required (Ref 24-22-00).

 4.  System Test - Mach Airspeed Warning System
__________________________________________
 A.  Test Mach Airspeed Warning System
 (1)  
Perform mach airspeed warning operational test. Do not remove electrical power.

 (2)  
Test Mach Airspeed Warning Switch Operation

 (a)  Verify that MACH AIRSPEED-GEAR DOWN DISPATCH selector switch is set at NORMAL position.
 EFFECTIVITY
 
 ALL  10 Page 501  Apr 25/7934-14-00
 (b)  
On airplanes with supplementary fuel tanks, verify that tanks are empty (Ref 12-11-01).

 (c)  
Pressurize auxiliary pitot-static system No. 2 (Ref 34-11-00).

 CAUTION: TO PREVENT DAMAGE TO INSTRUMENTS AND/OR EQUIPMENT,
_______ OBSERVE ALL CAUTIONS IN PITOT-STATIC SYSTEM -MAINTENANCE PRACTICES.
 (d)  On airplanes without spare engine kit installed, apply pressure for each test point listed in following table, and check that warning clacker comes on.
 On LH 001-003, 011-013, 051-057, 082; AF 101-116, 151-154, 172-173, 191-197; AZ 201-202, 209-211, 231-233; SN 301-302; IB 405; MD 501; GN 601; AT 701; VM 751, less airplanes incorporating SB 34-2148,
 STATIC PITOT DIFF. INDICATED TEST ALTITUDE PRESSURE PRESSURE PRESSURE AIRSPEED POINT_____ (FEET) ___________ (IN HG ABS) ___________ (KNOTS)
________ (IN HG ABS) ___________ (IN HG ABS) _________
 1 Sea Level 29.921 37.295 - 37.551 7.374 - 7.630 377.0 - 383.0
 2 10,000 20.577 28.222 - 28.484 7.645 - 7.907 383.3 - 389.3
 3 20,000 13.750 21.842 - 22.113 8.092 - 8.363 393.5 - 399.5
 4 30,000 8.885 15.060 - 15.225 6.175 - 6.340 347.1 - 351.4
 5 40,000 5.538 9.387 -9.490 3.849 - 3.952 277.4 - 280.9

 On LH 004-010, 014-050, 058-070, 083-099; AF 117-150, 155-171,
 174-190, 198-199; AZ 203-208, 212-230, 234-299; SN 303-399; IB 406-499;
 MD 502-599; GN 602-699; AT 702-750; VM 752-799, plus airplanes incorporating
 SB 34-2148,

 STATIC PITOT DIFF. INDICATED TEST ALTITUDE PRESSURE PRESSURE PRESSURE AIRSPEED POINT_____ (FEET) __________ (IN HG ABS) ___________ (KNOTS)
________ (IN HG ABS) ___________ (IN HG ABS) _________
 1 Sea Level 29.921 37.347 - 37.604 7.426 - 7.683 378.2 - 384.2
 2 10,000 20.577 28.271 - 28.534 7.694 - 7.957 384.5 - 390.5
 3 20,000 13.750 21.822 - 22.093 8.072 - 8.343 393.1 - 399.1
 4 30,000 8.885 14.964 - 15.137 6.079 - 6.252 344.8 - 349.1
 5 40,000 5.538 9.338 -9.440 3.800 - 3.902 275.7 - 279.2

 (e)  On airplanes with spare engine kit installed, apply pressure for each test point listed in following table and check that warning clacker comes on. STATIC PITOT DIFF. INDICATED
 TEST ALTITUDE PRESSURE PRESSURE PRESSURE AIRSPEED POINT_____ (FEET) ___________ (IN HG ABS) ___________ (KNOTS)
________ (IN HG ABS) ___________ (IN HG ABS) _________
 1 Sea Level 29.921 34.144 - 34.329 4.223 - 4.408 290.0 - 296.0
 2 10,000 20.577 24.800 - 24.985 4.223 - 4.408 290.0 - 296.0
 3 20,000 13.750 17.973 - 18.158 4.223 - 4.408 290.0 - 296.0
 4 30,000 8.885 13.108 - 13.293 4.223 - 4.408 290.0 - 296.0
 5 40,000 5.538 11.264 - 11.449 4.223 - 4.408 290.0 - 296.0

 EFFECTIVITY

 
 ALL  22 Page 502  Apr 25/8634-14-00
 (3) Test Gear Down Dispatch Airspeed Warning Switch Operation
 (a)  
Verify that MACH AIRSPEED-GEAR DOWN DISPATCH selector switch is set at GEAR DOWN DISPATCH position.

 (b)  
On airplanes with supplementary fuel tanks, verify that tanks are empty (Ref 12-11-01).

 (c)  
Pressurize auxiliary pitot-static system No. 2 (Ref 34-11-00).

 CAUTION: TO PREVENT DAMAGE TO INSTRUMENTS AND/OR EQUIPMENT,
_______ OBSERVE ALL CAUTIONS IN PITOT-STATIC SYSTEM -MAINTENANCE PRACTICES.
　
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