Configuration Warning System Test

Boeing 727-100, AD 88-22-09

Revised 27-Mar-2001
 
Back To Index

*** NOTE*** CAUTION FLAPS, SLATS CONTROL SURFACES, FLIGHT AND GROUND SPOILERS WILL OPERATE AS LEVERS ARE MOVED. So don't squash or decapitate some poor sod.

Test Thrust Lever Actuated Take Off Warning Switch (S197)

  1. Apply electrical power and to the airplane
  2. Provide A and B system hydraulic power IAW Maint Practices 27-62-0
  3. Close aural warning horn and lever latch and safety relay circuit breakers on p6 panel.
  4. Retard thrust levers to idle stop.
  5. Retract flaps, place speedbrake control lever in up, or position stabiliser outside of green band range to ensure take off warning horn will sound.
  6. Advance No3 thrust lever forward from the idle stop until the warning horn sounds. Check that dimension measured when advancing lever is IAW Maint Manual ref. 31-26-21 and 36-26-0. As amended by FAA AD 90-03-18.
  7. Return flaps, speed brake lever or stabiliser, whichever was repositioned for test to the original position, as required.

Test Upper and Lower Stabiliser Take Off Warning Switches (S532 and S534)

  1. Close aural warning horn and lever latch and lights and T/O and cabin press aural warn circuit breakers on P6 panel.
  2. Set flaps in take off range and retract speedbrakes.
  3. Advance No3 thrust lever full forward to ensure warning horn will sound during test.
  4. From within the green band range, move stabiliser in APL NOSE DN direction. Check that the stabiliser trim indicator indicates one half unit intoone half of green band when the horn sounds.
  5. Move stabiliser in APL NOSE UP direction. Check that the stabiliser trim indicates one half unit out of green band when horn stops.
  6. Continue to move stabiliser in APL NOSE UP direction. Check that stabiliser trim indicates one half unit into one half unit out of green band when horn sounds.
  7. Move stabiliser in APL NOSE DN direction.
  8. Check that stabiliser trim indicates one half unit into, to one half unit out of green band when horn stops.

Test Flap Take Off Warning Switch

  1. Pressurise A system hydraulics.
  2. Close aural warning horn and lever latch and safety relay circuit breakers on panel P6.
  3. Advance No3 thrust lever to full forward to ensure warning horn will sound during test.
  4. Move flap control lever towards flap down position and check that the warning horn sounds at all detent positions except positions in to 5 to 25 degree range.
  5. Position flap control lever to UP too fully retract the flaps.

Test Speed Brake Take Off Warning Switch (S194)

*** NOTE*** CAUTION FLAPS, SLATS CONTROL SURFACES, FLIGHT AND GROUND SPOILERS WILL OPERATE AS LEVERS ARE MOVED.

  1. Provide A and B system hydraulic power IAW Maint Practices 27-62-0
  2. Set stabiliser within green band range.
  3. Position flaps in take off range.
  4. Retract speed brakes.
  5. Close aural warning horn, lever latch and lights and T/O and cabin press aural warn circuit breakers on panel P6.
  6. Advance No3 thrust lever to full forward position to ensure warning horn will sound during test.
  7. Lift speed brake lever out of DN detent and move lever aft. Check that the warning horn sound intermittently reaches position, and continues as the lever is moved fully aft. Measure lever travel along upper edge of the indicator plate.
  8. Return speed brake lever forward to DN position. Check that the horn stops when the lever reaches the position 2 to 5 degrees (0.19 to 0.48 inch) aft. Check that the horn does not sound with the lever in DN detent.
  9. Return thrust lever to idle position, or release EPR Eng. 1 and 3 test switch as applicable.

Test LE TE Flap Aural Warning System (No Engine Running) - Aircraft with LE Warn Test and LE Override Test Switches S1010 and S1011 installed on P6.

Note Condition Engines not running. Airline on Ground Using External Power.

Prepare to Test

  • Position stabiliser so position is within one unit of centre green band.
  • Speed brake lever in zero (DN) detent.
  • Retract flaps and check lever in zero detent.
  • Throttle levers at idle position.
  • Check the following circuit breakers are open on P6-1 drain mast heaters - air (C147darin mast heaters - ground (C148)
  • Close the following circuit breakers at P6-3. Lever latch (C122), landing horn (C124) and at P6-4 flap pos ind LE (C193), flap ind pos test (C219)

Test LE and TE Flap Aural Warn System

  1. Fully advance No3 throttle. Intermittent warning horn sounds.
  2. Set and hold LE aural warn test switch (S1010) to override position. Horn continues to sound.
  3. Extend flaps to position 2. Horn continues to sound. LE flaps green light on panel P3 comes on.
  4. Extend flaps to position 5. Horn stops.
  5. Release switch S1010, move No3 thrust lever from fully forward to idle and back to fully forward. Horn remains silent.
  6. Extend flaps to 25 position. Horn remains silent.
  7. Set and hold flaps position test switch on LE Flap position test module (M119) at P11 panel to position test mode. All green Flap and Slat lights come on.
  8. Set and hold LE aural warn test switch (S1011) to Left LE Test position. Horn remains silent. No4 Slat green light goes out.
  9. Recycle No3 thrust lever as in step 5 above. Horn sounds.
  10. Return LE aural warn test switch to Normal position. Horn stops No4 SLAT green light comes on.
  11. Set and hold LE aural warn test switch to right LE test position. Horn remains silent. No5 Slat green light goes out.
  12. Recycle No3 thrust lever as in step 5 above. Horn sounds.
  13. Return LE aural warn test switch to normal position. Horn stops No5 slat green light comes on.
  14. Set and hold LE override test switch (S1010) to override position. Extend flaps to 30 position. Horn sounds at or before flaps 30 position; continue extending flaps horn remains sounding at flaps fully extended. Retract to flaps 30, horn continues to sound. Retract flaps to flaps 25, horn stops.
  15. Retract flaps to position 5. Horn remains silent.
  16. Retract flaps to position 2. Horn sounds. The green slat No4 and No5 light remains on.
  17. Release LE aural warn override test switch. The green slat light No4 and No5 goes out.
  18. Recycle No3 thrust lever as in step 5. Horn continues to sound.
  19. Return flaps to position 5. Horn stops. All LE annunciator lights come on.
  20. Return flaps position test on LE flap position test module (M119) to off position. The green LE position lights go out and green LE flaps light on panel P2 remains on.
Restore all controls, switches and systems to normal
Back To Index