Narrative:

Departing lga. Talking to ZNY. Cleared to climb to FL280. Passing FL260, several critical things all occurred simultaneously: ATC amended assigned altitude to FL270. Flight attendants attempted to get our attention (due to intermittent problems with the interphone system) by gaining unannounced access through our secured 'enhanced cockpit door,' thus causing the aural warning to sound. The altitude warning chimed, because the autoplt failed to capture FL270, and had ascended to FL274, at which time the first officer disengaged the autoplt and manually descended to FL270. Coincidental TCASII TA for traffic approximately 1000 ft above and 2 mi lateral. Our attention was focused primarily on a perceived/suspected unauthorized cockpit access attempt. (Departing nyc under an 'orange threat level.') supplemental 579370: as first officer, set FL270 in altitude alert window, both TCASII alert and enhanced cockpit door aural alert sounded. First officer selected 'deny' position on the flight deck door control panel and looked for traffic while captain attempted to establish communications with the flight attendants. The first officer sighted traffic and noticed autoplt failed to capture FL270. Climb was stopped at FL274 and returned to FL270.

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Original NASA ASRS Text

Title: FLT CREW OF B757 CLBS ABOVE CLRED ALT AFTER RECEIVING MULTIPLE COCKPIT AURAL WARNINGS SIMULTANEOUSLY WITH AMENDED ALT CLRNC, ALT ALERT, AND TCASII TA.

Narrative: DEPARTING LGA. TALKING TO ZNY. CLRED TO CLB TO FL280. PASSING FL260, SEVERAL CRITICAL THINGS ALL OCCURRED SIMULTANEOUSLY: ATC AMENDED ASSIGNED ALT TO FL270. FLT ATTENDANTS ATTEMPTED TO GET OUR ATTN (DUE TO INTERMITTENT PROBS WITH THE INTERPHONE SYS) BY GAINING UNANNOUNCED ACCESS THROUGH OUR SECURED 'ENHANCED COCKPIT DOOR,' THUS CAUSING THE AURAL WARNING TO SOUND. THE ALT WARNING CHIMED, BECAUSE THE AUTOPLT FAILED TO CAPTURE FL270, AND HAD ASCENDED TO FL274, AT WHICH TIME THE FO DISENGAGED THE AUTOPLT AND MANUALLY DSNDED TO FL270. COINCIDENTAL TCASII TA FOR TFC APPROX 1000 FT ABOVE AND 2 MI LATERAL. OUR ATTN WAS FOCUSED PRIMARILY ON A PERCEIVED/SUSPECTED UNAUTH COCKPIT ACCESS ATTEMPT. (DEPARTING NYC UNDER AN 'ORANGE THREAT LEVEL.') SUPPLEMENTAL 579370: AS FO, SET FL270 IN ALT ALERT WINDOW, BOTH TCASII ALERT AND ENHANCED COCKPIT DOOR AURAL ALERT SOUNDED. FO SELECTED 'DENY' POS ON THE FLT DECK DOOR CTL PANEL AND LOOKED FOR TFC WHILE CAPT ATTEMPTED TO ESTABLISH COMS WITH THE FLT ATTENDANTS. THE FO SIGHTED TFC AND NOTICED AUTOPLT FAILED TO CAPTURE FL270. CLB WAS STOPPED AT FL274 AND RETURNED TO FL270.

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.