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Page Title:
Table 4-2. INDICATED AIRSPEED-KNOTS vs. MACH NO. AT VARIOUS ALTITUDES |
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 TM 55-4920-416-13
Section IV
NAVAER 17-15C-539
TABLE 4-2
INDICATED AIRSPEED-KNOTS vs. MACH NO. AT VARIOUS ALTITUDES
Column No.
1
2
3
4
5
6
7
8
9
10
11
Altitude Ft.
0
1,000
2,000
3,000
5,000
7,000
10,000
20,000
30,000
40,000
50,000
MACH No.
KNOTS-INDICATED AIRSPEED
.3
198
195
.4
265
260
255
251
.5
330
325
319
313
.6
397
390
383
376
363
.7
463
455
448
440
426
412
.8
529
520
512
504
488
482
448
.9
595
586
577
568
550
532
505
1.0
661
652
642
632
612
592
566
1.2
625
578
1.5
653
604
2.0
643
653
2.5
660
c. Determine the ranges of the instrument to be tested.
h. Close VACUUM CONTROL VALVES 1 & 2 and open
d. Table 4-2 will apply only to that portion between
PRESSURE CONTROL VALVES 3 & 4.
horizontal lines defined by the range of the instrument. For
i. Set ALTIMETER barometric correction dial by means
instance, if the Mach Indicator has a range of from .5 Mach to
of its front lower left corner adjusting knob.
2.2 Mach, the working part of the chart will fall between the
j. Throw power switch to ON.
horizontal lines .5 and 2.0.
k. Slowly open the VACUUM INCREASE CONTROL
e. Select approximately eight check points in Table 4-2
VALVE 2. The master panel ALTIMETER will start to show an
that fall in the working part as established in Note preceding
increase in simulated altitude.
step a. above.
l. Gradually open the VACUUM INCREASE VALVE 2
f. Set VACUUM SELECTOR at MACHMETER
until ALTIMETER needle just passes the desired altitude check
VACUUM setting.
point as selected from Table 4-2.
g. Set PRESSURE SELECTOR at MACHMETER
m. Slowly open the VACUUM DECREASE VALVE 1 until
ALTIMETER stabilizes at the desired point.
20
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