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Technical Provisions for Mode S Services and Extended Squitter

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

DE-2 <strong>Technical</strong> <strong>Provisions</strong> <strong>for</strong> <strong>Mode</strong> S <strong>Services</strong> <strong>and</strong> <strong>Extended</strong> <strong>Squitter</strong><br />

Coding<br />

(Binary) (Decimal) Meaning<br />

00 0 No valid Vertical Target State data is available<br />

01 1<br />

10 2 Holding altitude<br />

11 3 FMS/RNAV system<br />

Autopilot control panel selected value, such as <strong>Mode</strong> Control Panel<br />

(MCP) or Flight Control Unit (FCU)<br />

D.2.4 TARGET ALTITUDE TYPE<br />

This one bit (ME bit 10, Message bit 42) subfield shall be used to identify whether the altitude reported in the “Target<br />

Altitude” subfield is referenced to mean sea level (MSL) or to a flight level (FL). A value of ZERO (0) shall indicate target<br />

altitude referenced to pressure-altitude (flight level). A value of ONE (1) shall indicate a target altitude referenced to<br />

barometric corrected altitude (mean sea level).<br />

D.2.5 TARGET ALTITUDE CAPABILITY<br />

This 2-bit subfield (ME bits 12 — 13, Message bits 44 — 45) shall be used to describe the aircraft’s capabilities <strong>for</strong><br />

providing the data reported in the target altitude subfield. The target altitude capability subfield shall be encoded as<br />

specified in the following table.<br />

Coding<br />

(Binary) (Decimal)<br />

Meaning<br />

Draft<br />

00 0 Capability <strong>for</strong> reporting holding altitude only<br />

01 1<br />

10 2<br />

11 3 Reserved<br />

Capability <strong>for</strong> reporting either holding altitude or autopilot control panel<br />

selected altitude<br />

Capability <strong>for</strong> reporting either holding altitude, autopilot control panel<br />

selected altitude, or any FMS/RNAV level-off altitude<br />

D.2.6 VERTICAL MODE INDICATOR<br />

This 2-bit (ME bits 14 — 15, Message bits 46 — 47) subfield shall be used to indicate whether the target altitude is in the<br />

process of being acquired (i.e. aircraft is climbing or descending toward the target altitude) or whether the target altitude<br />

has been acquired/being held. The Vertical <strong>Mode</strong> Indicator subfield shall be encoded as specified in the following table.<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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