<< >> NASA ASRS Report 1319044, December 2015

B737 captain is informed by nct TRACON that the crossing restriction at archi is 8000 feet while the DYAMD2 arrival and the ILS 28R both show it as 7000 feet. The crew was below 8000 feet when informed.

Attributes
ACN	1319044
Time
Date	201512
Local Time Of Day	1801-2400
Place
Locale Reference	SFO.Airport
State Reference	CA
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Route In Use	STAR DYAMD2
Flight Plan	IFR
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 178 Flight Crew Type 8450
Events
Anomaly	Deviation - Altitude Crossing Restriction Not Met Deviation - Altitude Overshoot Deviation - Procedural Clearance

Narrative:

Cleared to descend via DYAMD2 arrival. After flowz maintain 11000. Then the clearance that we heard was descend to 5000; after archi cleared for ILS 28R approach. I put 5000 in MCP window; first officer engaged VNAV and stated that all altitudes are protected as the FMA was in VNAV pth and I concurred. As we were descending thru 8000 to cross archi at 7000 per the approach ATC asked for our altitude stating that we 'should' have been given maintain 8000 until archi which is nonstandard per both DYAMD2 arrival and ILS 28R approach. If we were given 8000 until archi; neither the first officer nor myself heard or understood this as intended.

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Original NASA ASRS Text

Title: B737 Captain is informed by NCT TRACON that the crossing restriction at ARCHI is 8000 feet while the DYAMD2 Arrival and the ILS 28R both show it as 7000 feet. The crew was below 8000 feet when informed.

Narrative: Cleared to descend via DYAMD2 arrival. After FLOWZ maintain 11000. Then the clearance that we heard was Descend to 5000; after ARCHI Cleared for ILS 28R approach. I put 5000 in MCP window; FO engaged VNAV and stated that all altitudes are protected as the FMA was in VNAV PTH and I concurred. As we were descending thru 8000 to cross ARCHI at 7000 per the approach ATC asked for our altitude stating that we 'should' have been given maintain 8000 until ARCHI which is nonstandard per both DYAMD2 arrival and ILS 28R approach. If we were given 8000 until ARCHI; neither the FO nor myself heard or understood this as intended.

Data retrieved from NASA's ASRS site 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.