Federal Aviation Administration, DOT

Pt. 43, App. F

TABLE III - FRICTION - Continued
Tolerance
(feet)

Altitude (feet)
40,000 ..................................................................
50,000 ..................................................................

180
250

TABLE IV - PRESSURE-ALTITUDE DIFFERENCE
Altitude difference
(feet)

Pressure (inches of Hg)
28.10
28.50
29.00
29.50
29.92
30.50
30.90
30.99

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Section1,727
Section1,340
Section863
Section392
0
+ 531
+ 893
+ 974

(Secs. 313, 314, and 601 through 610 of the Federal Aviation Act of 1958 (49 U.S.C. 1354, 1355,
and 1421 through 1430) and sec. 6(c), Dept. of
Transportation Act (49 U.S.C. 1655(c)))
[Amdt. 43-2, 30 FR 8262, June 29, 1965, as
amended by Amdt. 43-7, 32 FR 7587, May 24,
1967; Amdt. 43-19, 43 FR 22639, May 25, 1978;
Amdt. 43-23, 47 FR 41086, Sept. 16, 1982; Amdt.
43-31, 54 FR 34330, Aug. 18, 1989; Doc. No.
FAA-2015-1621, Amdt. 43-49, 81 FR 96700, Dec.
30, 2016]

spaschal on DSK3GDR082PROD with CFR

APPENDIX F TO PART 43 - ATC
TRANSPONDER TESTS AND INSPECTIONS
The ATC transponder tests required by
Section 91.413 of this chapter may be conducted
using a bench check or portable test equipment and must meet the requirements prescribed in paragraphs (a) through (j) of this
appendix. If portable test equipment with appropriate coupling to the aircraft antenna
system is used, operate the test equipment
for ATCRBS transponders at a nominal rate
of 235 interrogations per second to avoid possible ATCRBS interference. Operate the test
equipment at a nominal rate of 50 Mode S interrogations per second for Mode S. An additional 3 dB loss is allowed to compensate for
antenna coupling errors during receiver sensitivity measurements conducted in accordance with paragraph (c)(1) when using portable test equipment.
(a) Radio Reply Frequency:
(1) For all classes of ATCRBS transponders, interrogate the transponder and
verify that the reply frequency is 1090 Section3
Megahertz (MHz).
(2) For classes 1B, 2B, and 3B Mode S transponders, interrogate the transponder and
verify that the reply frequency is 1090 Section3
MHz.
(3) For classes 1B, 2B, and 3B Mode S transponders that incorporate the optional 1090
Section1 MHz reply frequency, interrogate the

transponder and verify that the reply frequency is correct.
(4) For classes 1A, 2A, 3A, and 4 Mode S
transponders, interrogate the transponder
and verify that the reply frequency is 1090 Section1
MHz.
(b) Suppression: When Classes 1B and 2B
ATCRBS Transponders, or Classes 1B, 2B,
and 3B Mode S transponders are interrogated
Mode 3/A at an interrogation rate between
230 and 1,000 interrogations per second; or
when Classes 1A and 2A ATCRBS Transponders, or Classes 1B, 2A, 3A, and 4 Mode S
transponders are interrogated at a rate between 230 and 1,200 Mode 3/A interrogations
per second:
(1) Verify that the transponder does not respond to more than 1 percent of ATCRBS interrogations when the amplitude of P2 pulse
is equal to the P1 pulse.
(2) Verify that the transponder replies to
at least 90 percent of ATCRBS interrogations
when the amplitude of the P2 pulse is 9 dB
less than the P1 pulse. If the test is conducted with a radiated test signal, the interrogation rate shall be 235 Section5 interrogations
per second unless a higher rate has been approved for the test equipment used at that
location.
(c) Receiver Sensitivity:
(1) Verify that for any class of ATCRBS
Transponder, the receiver minimum triggering level (MTL) of the system is Section73 Section4
dbm, or that for any class of Mode S transponder the receiver MTL for Mode S format
(P6 type) interrogations is Section74 Section3 dbm by use
of a test set either:
(i) Connected to the antenna end of the
transmission line;
(ii) Connected to the antenna terminal of
the transponder with a correction for transmission line loss; or
(iii) Utilized radiated signal.
(2) Verify that the difference in Mode 3/A
and Mode C receiver sensitivity does not exceed 1 db for either any class of ATCRBS
transponder or any class of Mode S transponder.
(d) Radio Frequency (RF) Peak Output
Power:
(1) Verify that the transponder RF output
power is within specifications for the class of
transponder. Use the same conditions as described in (c)(1)(i), (ii), and (iii) above.
(i) For Class 1A and 2A ATCRBS transponders, verify that the minimum RF peak
output power is at least 21.0 dbw (125 watts).
(ii) For Class 1B and 2B ATCRBS Transponders, verify that the minimum RF peak
output power is at least 18.5 dbw (70 watts).
(iii) For Class 1A, 2A, 3A, and 4 and those
Class 1B, 2B, and 3B Mode S transponders
that include the optional high RF peak output power, verify that the minimum RF peak
output power is at least 21.0 dbw (125 watts).
(iv) For Classes 1B, 2B, and 3B Mode S
transponders, verify that the minimum RF

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