ACR X ALTDEV DSCNT BELOW ASSIGNED ALT ON PROFILE DSCNT.

1994-11 · NASA ASRS report 289705

Date: 1994-11 · Aircraft: Commercial Fixed Wing

Anomalies: deviation-altitude-overshoot|deviation-discrepancy-procedural-clearance|deviation-discrepancy-procedural-published-material-policy

Synopsis

ACR X ALTDEV DSCNT BELOW ASSIGNED ALT ON PROFILE DSCNT.

Narrative

ACR X ON THE DSCNT INTO DEN AND ASSIGNED TO CROSS SHREW AT 17000 FT. WE WERE THEN CLRED FOR THE PROFILE DSCNT AND TOLD TO CONTACT DEN APCH. I TOLD THE CAPT I WAS SETTING 11000 FT IN THE MCP SINCE THE FMS WAS PREPROGRAMMED TO CROSS SHREW AT 17000 FT. HE AGREED. I CONTACTED DEN APCH. THEY ASKED IF WE WERE ON THE PROFILE DSCNT. I RESPONDED AFFIRMATIVE; PROFILE DSCNT DOWN TO 11000 FT. THERE WAS NO RESPONSE; ALTHOUGH APCH CTL WAS NOT BUSY -- AT LEAST ON THIS FREQ. AS WE DSNDED THROUGH ABOUT 13200 FT THE CTLR ADVISED THAT THE PROFILE DSCNT CALLED FOR US TO STOP AT 14000 FT. AT THIS POINT WE WERE DSNDING THROUGH 13000 FT. THE CTLR ADVISED US TO CLB BACK AND MAINTAIN 13000 FT. WE COMPLIED. I LOOKED DOWN AT THE PROFILE DSCNT PLATE AND DISCOVERED MY ERROR. I HAD MISREAD THE PLATE. COMING IN FROM THE SW REQUIRED US TO STOP AT 14000 FT; COMING IN FROM THE SE OVER KIOWA REQUIRED A DSCNT TO 11000 FT. THE WHOLE PROB STARTED WITH ME MISREADING THE PLATE. THE CAPT HAD A CHANCE TO CATCH THE MISTAKE BUT WAS DISTRACTED WITH OTHER DUTIES. THE APCH CTLR HAD A CHANCE TO INTERVENE WHEN I SAID 'AFFIRMATIVE; PROFILE DSCNT DOWN TO 11000 FT;' BUT DID NOT CATCH IT. THIS KIND OF INCIDENT COULD BE EASY TO AVOID. INSTEAD OF GIVING A CLRNC FOR THE PROFILE DSCNT; ATC SHOULD GIVE A CLRNC TO THE ALT REQUIRED BY THE PROFILE. A SIMPLE 'CLRED FOR PROFILE DSCNT; MAINTAIN 14000 FT' WOULD PRECLUDE ANY CHANCE OF MISREADING THE PLATE.

Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.

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