859 

Federal Aviation Administration, DOT 

Pt. 43, App. F 

T

ABLE

III—F

RICTION

—Continued 

Altitude (feet) 

Tolerance 

(feet) 

40,000 ..................................................................

180 

50,000 ..................................................................

250 

T

ABLE

IV—P

RESSURE

-A

LTITUDE

D

IFFERENCE

 

Pressure (inches of Hg) 

Altitude dif-

ference 

(feet) 

28.10 ....................................................................

¥

1,727 

28.50 ....................................................................

¥

1,340 

29.00 ....................................................................

¥

863 

29.50 ....................................................................

¥

392 

29.92 ....................................................................

0 

30.50 ....................................................................

+ 531 

30.90 ....................................................................

+ 893 

30.99 ....................................................................

+ 974 

(Secs. 313, 314, and 601 through 610 of the Fed-
eral 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] 

A

PPENDIX

F 

TO

P

ART

43—ATC 

T

RANSPONDER

T

ESTS AND

I

NSPECTIONS

 

The ATC transponder tests required by 

§ 91.413 of this chapter may be conducted 
using a bench check or portable test equip-
ment and must meet the requirements pre-
scribed in paragraphs (a) through (j) of this 
appendix. If portable test equipment with ap-
propriate 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 pos-
sible ATCRBS interference. Operate the test 
equipment at a nominal rate of 50 Mode S in-
terrogations per second for Mode S. An addi-
tional 3 dB loss is allowed to compensate for 
antenna coupling errors during receiver sen-
sitivity measurements conducted in accord-
ance with paragraph (c)(1) when using port-
able test equipment. 

(a) Radio Reply Frequency: 
(1) For all classes of ATCRBS tran-

sponders, interrogate the transponder and 
verify that the reply frequency is 1090 

±

3 

Megahertz (MHz). 

(2) For classes 1B, 2B, and 3B Mode S tran-

sponders, interrogate the transponder and 
verify that the reply frequency is 1090 

±

3 

MHz. 

(3) For classes 1B, 2B, and 3B Mode S tran-

sponders that incorporate the optional 1090 

±

1 MHz reply frequency, interrogate the 

transponder and verify that the reply fre-
quency is correct. 

(4) For classes 1A, 2A, 3A, and 4 Mode S 

transponders, interrogate the transponder 
and verify that the reply frequency is 1090 

±

1 

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 Tran-
sponders, or Classes 1B, 2A, 3A, and 4 Mode S 
transponders are interrogated at a rate be-
tween 230 and 1,200 Mode 3/A interrogations 
per second: 

(1) Verify that the transponder does not re-

spond to more than 1 percent of ATCRBS in-
terrogations when the amplitude of P

2

pulse 

is equal to the P

1

pulse. 

(2) Verify that the transponder replies to 

at least 90 percent of ATCRBS interrogations 
when the amplitude of the P

2

pulse is 9 dB 

less than the P

1

pulse. If the test is con-

ducted with a radiated test signal, the inter-
rogation rate shall be 235 

±

5 interrogations 

per second unless a higher rate has been ap-
proved for the test equipment used at that 
location. 

(c) Receiver Sensitivity: 
(1) Verify that for any class of ATCRBS 

Transponder, the receiver minimum trig-
gering level (MTL) of the system is 

¥

73 

±

4 

dbm, or that for any class of Mode S trans-
ponder the receiver MTL for Mode S format 
(P6 type) interrogations is 

¥

74 

±

3 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 trans-
mission line loss; or 

(iii) Utilized radiated signal. 
(2) Verify that the difference in Mode 3/A 

and Mode C receiver sensitivity does not ex-
ceed 1 db for either any class of ATCRBS 
transponder or any class of Mode S trans-
ponder. 

(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 de-
scribed in (c)(1)(i), (ii), and (iii) above. 

(i) For Class 1A and 2A ATCRBS tran-

sponders, verify that the minimum RF peak 
output power is at least 21.0 dbw (125 watts). 

(ii) For Class 1B and 2B ATCRBS Tran-

sponders, 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 out-
put 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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