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(2) Test flap takeoff warning switch S130 (Fig. 502, Sheet 2).
NOTE: This test should be accomplished with the flap system properly adjusted and with hydraulic system A pressurized.
(a)
Check that speed brakes are down and stabilizer position indicator is at least one-half unit into green band.
(b)
Advance either thrust lever full forward.
(c)
With flaps retracted the warning horn shall sound.
(d)
Place flap control lever in 1-unit detent and check that the warning horn stops sounding before the flaps reach the 1-unit position.
(e)
Place the flap control lever in the 15- or 25-unit detent as applicable, refer to 5.B.(3) and check that the warning horn remains silent.
(f)
Place the flap control lever in the 25- or 30-unit detent as applicable, refer to 5.B.(3) and check that the warning horn sounds as the flaps move from the 15-unit position.
(g)
Position flap control lever to 1 unit.
(h)
Return thrust lever to idle stop.
(3) Test Stabilizer Takeoff Warning Switches (Fig. 502, Sheet 1)
(a)
Set flap control lever to any position between 1 and 25 units.
(b)
Advance either thrust lever full forward.
(c)
Starting within green band range, move stabilizer in APL NOSE DOWN direction.
(d)
Check that intermittent horn sounds when stabilizer position pointer is within + one-half unit of end of green band.
(e)
Move stabilizer in APL NOSE UP direction and check that horn is silenced when stabilizer position pointer is within + one-half unit of end of green band.
(f)
Continue to move stabilizer in APL NOSE UP direction to other end of green band.
(g)
Check that warning horn sound when stabilizer position pointer is within + one-half unit of end of green band.
(h)
Move stabilizer in APL NOSE DOWN direction and check that horn is silenced when stabilizer position pointer is within + one-half unit of end of green band.
(i)
Return stabilizer position pointer to center of green band and set flap control lever to zero units.
(j)
Return thrust lever to idle stop.
31-26-0 Jun 20/90
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(4) Test speed brake takeoff warning switch (S129 or S651).
NOTE: See Detail D, Fig. 502 for effectivity of switches S129 and S651.
(a)
Set flaps in takeoff range.
(b)
Advance either thrust lever fully forward.
(c)
On switch S129, pull speed brake lever aft to the ARMED detent. Check that warning horn sounds. Return speed brake lever to down position and check that horn stops.
(d)
On switch S651, lift speed brake lever up from bottom of DN detent but do not move lever aft; then, depress lever back into detent. Check that horn sounds when lever is lifted from detent and stops when lever is returned to DN detent.
(e)
Return thrust lever to idle stop.
(5) Test speed brake arming switch (S276) (Fig. 502, Sheet 4), as applicable.
NOTE: If common attachment bolts which secure the speed brake takeoff warning switch, arming switch and autobrake off ramp switch were loosened, the arming switch should be tested. If an adjustment was not made to the speed brake takeoff warning switch this test is not necessary.
The weight of the airplane must be on the landing gear for this test.
(a) Make sure parking brake is released, if not release parking brake as follows:
NOTE: Ground interconnect valve must be manually overridden to allow parking brake to be released during tests on automatic speed brake system.
1) Open ground INTERCONNECT VALVE circuit breaker on P6 panel.
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