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Technical Provisions for Mode S Services and Extended Squitter

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Appendix CD CD-17<br />

AP/FD mode<br />

V/S-FPA value<br />

FMS ALT<br />

A/C ALT<br />

AP/FD status<br />

FCU ALT<br />

DRAFT - Working Paper ASP TSGWP11-01 <strong>for</strong> review by the TSG during the meeting in June 2011 in Paris<br />

Figure CD-3. Logic to derive the target altitude data in<strong>for</strong>mation<br />

D.2.4.4.2.2 Selected altitude from the altitude control panel<br />

When selected altitude from the altitude control panel is provided in bits 1 to 13, the status <strong>and</strong> mode bits (48 – 51) may<br />

be provided from the following sources:<br />

Status of altitude control panel<br />

mode bits (bit 48)<br />

Managed vertical mode (bit 49) Label 274 bit 11 (climb)<br />

Label 274 bit 12 (descent)<br />

Bus FMGC A<br />

Altitude hold mode (bit 50) Label 274 bit 19 (Alt mode)<br />

Bus FMGC A<br />

Approach mode (bit 51) Label 273 bit 23<br />

Bus AFS FCU<br />

A320 A340<br />

SSM labels 273/274 SSM labels 274/275<br />

Label 275 bit 11 (climb)<br />

Label 275 bit 15 (descent)<br />

Bus FMGEC G GE-1<br />

Label 275 bit 20 (Alt hold)<br />

Bus FMGEC G GE-1<br />

Label 273 bit 15<br />

Bus AFS FCU<br />

Draft<br />

CD.2.4.4.3 TRANSPONDER REGISTER NUMBER 4016 ON BOEING 747-400, 757 AND 767 AIRCRAFT<br />

In order to clarify how selected altitude in<strong>for</strong>mation from the altitude control panel <strong>and</strong> target altitude is reported in<br />

transponder register 4016, a mapping has been prepared to illustrate how the status <strong>and</strong> mode bits can be derived.<br />

Transponder<br />

register<br />

bit no. Description Label<br />

48 Status of mode bits SSM of 272 <strong>and</strong> 273<br />

49 Managed vertical mode 272 bit 13<br />

50 Altitude hold mode 272 bit 9 / 273 bit 19<br />

51 Approach mode 272 bit 9 / 273 bit 19<br />

54 Status of target altitude source bits SSM of new label (TBD)<br />

55<br />

56<br />

LOGIC<br />

Target altitude (label TBD)<br />

Target altitude source bits (label 271)<br />

Target altitude source bits New label (TBD)<br />

General <strong>for</strong>mat<br />

manager (GFM)<br />

DRAFT - Working Paper ASP TSGWP11-01 <strong>for</strong> review by the TSG during the meeting in June 2011 in Paris

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