S 725-226

 (12)
 Push the LSK that is adjacent to <PROBE HEAT L on the GROUND TESTS MENU.

 (a) Make sure bit 17 of label 270 is momentarily in the one state.
 S 865-227
 (13)
 Open the 6C33 AOA HEAT L circuit breaker on the P6 Main Power Distribution Panel.

 S 865-330

 (14)
 Close the 6C34 AOA HEAT R circuit breaker on the P6 Main Power Distribution Panel.

 S 725-229

 (15)
 Push the LSK that is adjacent to <PROBE HEAT R on the GROUND TESTS MENU.

 (a) Make sure bit 18 of label 270 stays in the zero state.
 S 865-230
 (16)
 Open the 6C34 AOA HEAT R circuit breaker on the P6 Main Power Distribution Panel.

 S 865-334

 (17)
 Close the 6D28 PROBE HEAT TAT L circuit breaker on the P6 Main Power Distribution Panel.

 S 725-242

 (18)
 Push the LSK that is adjacent to <PROBE HEAT L on the GROUND TESTS MENU.

 (a) Make sure bit 16 of label 270 is momentarily in the one state.
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747-400 MAINTENANCE MANUAL
 S 865-333
 (19)
 Open the 6D28 PROBE TAT L circuit breaker on the P6 Main Power Distribution Panel.

 S 085-231

 (20)
 Disconnect the ARINC 429 bus reader from the L ADC front panel TEST ONLY connector.

 S 485-232

 (21)
 Connect the ARINC 429 bus reader to the R ADC front panel TEST ONLY connector.

 S 865-812

 (22)
 Set the ARINC 429 bus reader to these parameters:

 Octal Label: 270
 SDI: 2 (Bit 10=1, Bit 9=0)
 Display: Binary

 (a)  Make sure bits 14, 15, 16, 17, and 18 of label 270 are in the zero state.
 S 865-813
 (23)
 Close the 6D31 PROBE HEAT PITOT R circuit breaker on the P6 Main Power Distribution Panel.

 S 725-814

 (24)
 Push the LSK that is adjacent to <PROBE HEAT R on the GROUND TESTS MENU.

 (a)  Make sure bit 15 of label 270 is momentarily in the one state.
 S 865-815
 (25) Open the 6D31 PROBE HEAT PITOT R circuit breaker on the P6 Main Power Distribution Panel.
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747-400
MAINTENANCE MANUAL

 S 865-317
 (26)
 Close the 6D32 PROBE HEAT AUX PITOT L circuit breaker on the P6 Main Power Distribution Panel.

 S 725-235

 (27)
 Push the LSK that is adjacent to <PROBE HEAT L on the GROUND TESTS MENU.

 (a) Make sure bit 14 of label 270 is momentarily in the one state.
 S 865-236
 (28)
 Open the 6D32 PROBE HEAT AUX PITOT L circuit breaker on the P6 Main Power Distribution Panel.

 S 865-E08

 (29)
 Close the 6C33 AOA HEAT L circuit breaker on the P6 Main Power Distribution Panel.

 S 725-244

 (30)
 Push the LSK that is adjacent to <PROBE HEAT L on the GROUND TESTS MENU.

 (a) Make sure bit 17 of label 270 stays in the zero state.
 S 865-319
 (31)
 Open the 6C33 AOA HEAT L circuit breaker on the P6 Main Power Distribution Panel.

 S 865-E09

 (32)
 Close the 6C34 AOA HEAT R circuit breaker on the P6 Main Power Distribution Panel.

 S 725-247

 (33)
 Push the LSK that is adjacent to <PROBE HEAT R on the GROUND TESTS MENU.

 (a) Make sure bit 18 of label 270 is momentarily in the one state.
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