NOTE: Verify that self-test meter is in RED range after reset to ensure actuator retraction.
(4A) Apply 5 +0.1 psig dynamic pressure to both pitot tubes on fin with static port at ambient.
CAUTION: DO NOT RAISE PRESSURE TO PITOT TUBES ON FIN ABOVE 6 PSIG AT ANY TIME.
(5)
Test Below Mach Region
(a)
Position stabilizer trim to 3 units.
(b)
Jiggle the elevator right-hand quadrant until a detent position is felt. (This is to ensure the system is centered.)
(c)
Measure elevator trailing edge position with reference to index plate and record. Observe that the measurement is 0.0 +0.l inch.
(d)
Apply conditions of step 1) of Fig. 501 to portable pressure equipment to simulate
0.708 mach. Observe mach trim coupler light and mach trim warning light is extinguished and self-test meter reads in the red range.
(e)
Measure and observe voltage between TP-4 (signal ground) and TP-88 of 22 to 32 volts dc and between TP-4 and TP-9 of less than one volt dc.
(f)
Measure right elevator position and note.
(6)
Test Performance Curve Start Point
(a)
Apply conditions of step 2) of figure 501 to portable pressure equipment to simulate
0.723 mach. Observe mach trim coupler light and mach trim warning light are extinguished.
(b)
Deleted
(c)
With a scale, measure and record position of right elevator. Observe difference of measurements from step (5)(f) is -0.02 inches to + 0.22 inches maximum.
(d)
Measure and observe voltage from TP-4 to TP-8 of 22 to 32 volts dc and between TP-4 and TP-9 of 28 (+ 1) volt dc.
(7)
Test Performance Curve First Break Point
(a)
Apply conditions of step 3) of figure 501 to portable pressure equipment to simulate
0.78 mach. Observe mach trim coupler light and mach trim warning light remain extinguished.
(b)
Jiggle the elevator for right-hand quadrant until a detent position is felt.
(c)
With a scale, measure and record position of right elevator. Observe difference of measurements from step (5)(f) is 0.84 inches minimum to 1.06 inches maximum. Nominal 0.95 inches.
NOTE: Increase the differential pressure slightly then drop back to specified pressure for each step in Fig. 501.
501
22-21-0 Page 504 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Jun 20/90
Step Static Diff. Pitot Press Mach Calib. Altitude
Press.
No. In. Hg. In. Hg. In. Hg. ABS No. A/S Feet
1) 11.104 4.408 15.512 0.708 296k 25,000
2) 11.104 4.630 15.734 0.723 303k 25,000
3) 11.104 5.474 16.578 0.780 328k 25,000
4) 11.104 6.058 17.162 0.815 344k 25,000
5) 11.104 7.630 18.734 0.900 383k 25,000
Mach Trim Data
Figure 501
500
May 15/70 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 22-21-0 Page 505
(8)
Test Performance Curve Second Break Point
(a)
Apply conditions of step 4) of figure 501 to portable pressure equipment to simulate
0.815 mach. Observe mach trim coupler light and mach trim warning light remain extinguished.
(b)
Jiggle the right-hand quadrant until a detent position is felt.
(c)
With a scale, measure and record position of right elevator. Observe difference of measurement from step (5)(f) is 1.72 inches minimum to 1.94 inches maximum. Nominal 1.83 inches.
(9)
Test Performance Curve Limit
(a)
Apply conditions of step 5) of figure 501 to portable pressure equipment to simulate
0.90 mach. Observe mach trim coupler light and mach trim warning light remain extinguished and self-test meter reads far to the right.
(b)
Jiggle right-hand elevator quadrant until a detent position is felt.
(c)
With a scale, measure and record position of right elevator. Observe difference of measurements from step (5)(f) is 1.72 inches minimum to 1.94 inches maximum. Nominal 1.83 inches.
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