spaschal on DSK3GDR082PROD with CFR

Pt. 43, App. E

14 CFR Ch. I (1-1-19 Edition)

at this pressure for at least 5 minutes, but
not more than 15 minutes, before the test
reading is taken. After the reading has been
taken, the pressure shall be increased further, in the same manner as before, until the
pressure corresponding to the second test
point (40 percent of maximum altitude) is
reached. The altimeter shall be kept at this
pressure for at least 1 minute, but not more
than 10 minutes, before the test reading is
taken. After the reading has been taken, the
pressure shall be increased further, in the
same manner as before, until atmospheric
pressure is reached. The reading of the altimeter at either of the two test points shall
not differ by more than the tolerance specified in Table II from the reading of the altimeter for the corresponding altitude recorded during the scale error test prescribed
in paragraph (b)(i).
(iii) After effect. Not more than 5 minutes
after the completion of the hysteresis test
prescribed in paragraph (b)(ii), the reading of
the altimeter (corrected for any change in
atmospheric pressure) shall not differ from
the original atmospheric pressure reading by
more than the tolerance specified in Table
II.
(iv) Friction. The altimeter shall be subjected to a steady rate of decrease of pressure approximating 750 feet per minute. At
each altitude listed in Table III, the change
in reading of the pointers after vibration
shall not exceed the corresponding tolerance
listed in Table III.
(v) Case leak. The leakage of the altimeter
case, when the pressure within it corresponds to an altitude of 18,000 feet, shall
not change the altimeter reading by more
than the tolerance shown in Table II during
an interval of 1 minute.
(vi) Barometric scale error. At constant atmospheric pressure, the barometric pressure
scale shall be set at each of the pressures
(falling within its range of adjustment) that
are listed in Table IV, and shall cause the
pointer to indicate the equivalent altitude
difference shown in Table IV with a tolerance of 25 feet.
(2) Altimeters which are the air data computer type with associated computing systems, or which incorporate air data correction internally, may be tested in a manner
and to specifications developed by the manufacturer which are acceptable to the Administrator.
(c) Automatic Pressure Altitude Reporting
Equipment and ATC Transponder System Integration Test. The test must be conducted
by an appropriately rated person under the
conditions specified in paragraph (a). Measure the automatic pressure altitude at the
output of the installed ATC transponder
when interrogated on Mode C at a sufficient
number of test points to ensure that the altitude reporting equipment, altimeters, and
ATC transponders perform their intended

functions as installed in the aircraft. The
difference between the automatic reporting
output and the altitude displayed at the altimeter shall not exceed 125 feet.
(d) Records: Comply with the provisions of
Section 43.9 of this chapter as to content, form, and
disposition of the records. The person performing the altimeter tests shall record on
the altimeter the date and maximum altitude to which the altimeter has been tested
and the persons approving the airplane for
return to service shall enter that data in the
airplane log or other permanent record.

TABLE I
Altitude

Section1,000 ..........................................
0 .....................................................
500 .................................................
1,000 ..............................................
1,500 ..............................................
2,000 ..............................................
3,000 ..............................................
4,000 ..............................................
6,000 ..............................................
8,000 ..............................................
10,000 ............................................
12,000 ............................................
14,000 ............................................
16,000 ............................................
18,000 ............................................
20,000 ............................................
22,000 ............................................
25,000 ............................................
30,000 ............................................
35,000 ............................................
40,000 ............................................
45,000 ............................................
50,000 ............................................

Equivalent
pressure
(inches of
mercury)
31.018
29.921
29.385
28.856
28.335
27.821
26.817
25.842
23.978
22.225
20.577
19.029
17.577
16.216
14.942
13.750
12.636
11.104
8.885
7.041
5.538
4.355
3.425

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255
280

TABLE II - TEST TOLERANCES
Tolerance
(feet)

Test
Case Leak Test ...............................................
Hysteresis Test:
First Test Point (50 percent of maximum
altitude) .................................................
Second Test Point (40 percent of maximum altitude) .......................................
After Effect Test ...............................................

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TABLE III - FRICTION
Tolerance
(feet)

Altitude (feet)
1,000 ....................................................................
2,000 ....................................................................
3,000 ....................................................................
5,000 ....................................................................
10,000 ..................................................................
15,000 ..................................................................
20,000 ..................................................................
25,000 ..................................................................
30,000 ..................................................................
35,000 ..................................................................

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