Narrative:

Departed phx on runway 26R. Flew dryheat 2 departure. After turning southeast on 140 degree heading, we were given additional headings east, then cleared direct bayta intersection, which we entered and flew LNAV direct to bayta, then the dryheat 2 departure. As the plane proceeded past adyan, the LNAV defaulted to heading 055 degrees, since we were to expect vectors to dryht. We flew past dryht on a heading of 055 degrees, then ATC queried what our clearance was. Our original on the ground clearance was 'dryht 2, dryht, J14.irw, as filed.' I told ATC. ATC said we missed the turn at dryht. Yes, we had not turned, but the dryheat 2 departure says 'expect radar vectors to dryht intersection,' which we received no vectors from ATC after bayta which is the reason the LNAV and us were flying heading 055 degrees after adyan. ATC should have cleared us direct dryht after adyan rather than assuming that since we were cleared direct bayta to fly the rest of the dryht 2 departure past adyan and onto dryht, then J74 as filed. The section of the departure should be a hard segment without radar vectors from adyan to dryht. Adyan is 99 NM from pxr VOR and should be hard segments for LNAV navigation. This is one of the few instrument departures with an 'expect radar vectors' past at least 3 waypoints being naved on the instrument departure. This may be the only SID with this discontinuity, on the diagram and in the text. I couldn't find any others.

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Original NASA ASRS Text

Title: B737 FLC CHALLENGES P50 CTLR'S INTERP OF DRYHEAT SID.

Narrative: DEPARTED PHX ON RWY 26R. FLEW DRYHEAT 2 DEP. AFTER TURNING SE ON 140 DEG HDG, WE WERE GIVEN ADDITIONAL HDGS E, THEN CLRED DIRECT BAYTA INTXN, WHICH WE ENTERED AND FLEW LNAV DIRECT TO BAYTA, THEN THE DRYHEAT 2 DEP. AS THE PLANE PROCEEDED PAST ADYAN, THE LNAV DEFAULTED TO HDG 055 DEGS, SINCE WE WERE TO EXPECT VECTORS TO DRYHT. WE FLEW PAST DRYHT ON A HDG OF 055 DEGS, THEN ATC QUERIED WHAT OUR CLRNC WAS. OUR ORIGINAL ON THE GND CLRNC WAS 'DRYHT 2, DRYHT, J14.IRW, AS FILED.' I TOLD ATC. ATC SAID WE MISSED THE TURN AT DRYHT. YES, WE HAD NOT TURNED, BUT THE DRYHEAT 2 DEP SAYS 'EXPECT RADAR VECTORS TO DRYHT INTXN,' WHICH WE RECEIVED NO VECTORS FROM ATC AFTER BAYTA WHICH IS THE REASON THE LNAV AND US WERE FLYING HDG 055 DEGS AFTER ADYAN. ATC SHOULD HAVE CLRED US DIRECT DRYHT AFTER ADYAN RATHER THAN ASSUMING THAT SINCE WE WERE CLRED DIRECT BAYTA TO FLY THE REST OF THE DRYHT 2 DEP PAST ADYAN AND ONTO DRYHT, THEN J74 AS FILED. THE SECTION OF THE DEP SHOULD BE A HARD SEGMENT WITHOUT RADAR VECTORS FROM ADYAN TO DRYHT. ADYAN IS 99 NM FROM PXR VOR AND SHOULD BE HARD SEGMENTS FOR LNAV NAV. THIS IS ONE OF THE FEW INST DEPS WITH AN 'EXPECT RADAR VECTORS' PAST AT LEAST 3 WAYPOINTS BEING NAVED ON THE INST DEP. THIS MAY BE THE ONLY SID WITH THIS DISCONTINUITY, ON THE DIAGRAM AND IN THE TEXT. I COULDN'T FIND ANY OTHERS.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.