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 TABLE III TO APPENDIX 1 TO 5.105:   FRICTION
 
Altitude (feet) Tolerance (feet) 
1,000  ±70 
2,000  +70 
3,000  +70 
5,000  +70 
10,000  +80 
15,000  +90 
20,000  +100 
25,000  +120 
30,000  +140 
35,000  +160 
40,000  +180 
50,000  +250 
 TABLE IV TO APPENDIX 1 TO 5.5105:  PRESSURE/ALTITUDE DIFFERENCE
 
Pressure (inches of Hg) Altitude difference (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 
 
Appendix 2 to 5.105  Transponder Tests and Inspections

(a) No person may use an ATC Transponder that is specified in Subpart C, Paragraph 7.110 of the Seventh Schedule unless, following any installation or maintenance on an ATC transponder where data correspondence error could be introduced, the integrated system has been tested, inspected, and found to comply with paragraph (c), of Appendix 2 to 5.105.

(b) The tests and inspections specified in this section must be conducted by -

(1) an Approved Maintenance Organization properly equipped to perform those functions and holding-

(i)      a  radio rating, Class III;

(ii)      a limited radio rating appropriate to the make and model transponder to be  tested;

(iii) a limited rating appropriate to the test to be performed, or

(2) a  holder of a continuous airworthiness maintenance program as provided in Schedule 12, or

(3) the manufacturer of the aircraft on which the transponder to be tested is installed, if the transponder was installed by that manufacturer.

Note: The ATC transponder tests 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.

(c) Radio Reply Frequency -

(1) for all classes of ATCRBS transponders, interrogate the transponder and verify that the reply frequency is 1090 ±3 Megahertz (MHz);

(2) for classes 1B, 2B, and 3B Mode S transponders, interrogate the transponder and verify that the reply frequency is 1090 ±3 MHz;

(3) for classes 1B, 2B, and 3B Mode S transponders that incorporate the optional 1090 ±1 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 ±1 MHz. (d) 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.
　
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