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A 737-300/400/500MAINTENANCE MANUAL
(f)
Non-volatile BITE memory stores the latest calculated longitude and accumulated BITE status record of the last two power-on periods. It also stores a summary of IRS discrete message words for the last six power on periods.
(g)
AIRPLANES WITH IRU -109 AND PREVIOUS; When BITE detects a failure, the analog pitch rate invalid discrete is set. The fault annunciator on the MSU is also lit and the fault ball is set.
(h)
AIRPLANES WITH IRU -110 AND SUBSEQUENT; When BITE detects a failure, the analog pitch rate invalid discrete is set. The fault annunciator on the MSU is also lit.
(2) Interface Test
(a) Pressing the test switch on the (IRU or setting the data display selector switch on the ISDU to the TEST position) activates the manual interface test mode. This test mode is inhibited in the NAV mode when the ground speed exceeds 20 kts and in the ATT mode. The manual interface test causes the following to occur: 1) From 0 to 2 seconds, all MSU annunciator discretes are
activated, causing all four MSU annunciator to come on. Also, all ISDU display segments come on during this two second period.
2) From 2 to 10 seconds, all failure discretes and digital failure words are set to FAIL. The more visible results are that the EADI, EHSI, and RDDMI fault flags come into view.
3) After 10 seconds, each output of the IRS is set to a test value until the test switch is released.
4) Figure 19 shows test values of the IRU output parameters during self-test. Those parameters identified by flagnote 1 can be checked on the ISDU and/or the pilots' instruments. a) Drift Angle: -10° (L) b) Ground Speed: 200 Kts c) Inertial Vertical Speed: -600 ft/min
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A 737-300/400/500MAINTENANCE MANUAL
LABEL/PARAMETER TEST VALUE LABEL/PARAMETER TEST VALUE
362 ALONG TK HRZ ACCEL .02G 014/320 MAGNETIC HEADING * 15`
332 BODY LATERAL ACCEL .10G 366 N-S VELOCITY 200KTS (N)
331 BODY LONGIT ACCEL .02G 324 PITCH ANGLE * 5`
333 BODY NORMAL ACCEL .10G 336 PITCH ATT RATE 10`/SEC
326 BODY PITCH RATE 10`/SEC 334 PLATFORM HEADING 22.50`
327 BODY ROLL RATE 10`/SEC 010/310 PRESENT POS LAT * N 22`30'
330 BODY YAW RATE 10`/SEC 011/311 PRESENT POS LONG * E 22`30'
363 CROSS TK HRZ ACCEL .02G 360 POTENTIAL VERT SPD -600FPM
321 DRIFT ANGLE -10` (L) 325 ROLL ANGLE * 45` (R)
367 E-W VELOCITY 200KTS (E) 337 ROLL ATT RATE 10`/SEC
323 FLIGHT PATH ACCEL .02G 335 TRACK ANGLE RATE 4.0`/SEC
322 FLIGHT PATH ANGLE -5` 013/313 TRACK ANGLE TRUE * 00.0`
012/312 GROUND SPEED * 200KTS 317 TRACK ANGLE-MAG 5`
361 INERTIAL ALTITUDE 10,000FT 044/314 TRUE HEADING * 10`
365 INERTIAL VERT SPD -600FPM 364 VERTICAL ACCEL 0.16
370 IRS DISCRETES NA 1 016/316 WIND DIRECTION-TRUE* 30`
350 IRS MAINT DISCRETE NA 015/315 WIND SPEED 100KTS
277 IRS TEST
* THESE VALUES CAN BE READ ON INSTRUMENTS AND/OR ISDU
1 BITS 11,13,16 AND 17 ARE SET FOR 2 SECONDS AT START OF TEST
IRS Self Test Values
Figure 19
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