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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Flight crew of an medium large transport report a crossing restr deviation that resulted from an FMS waypoint bypass. The FMS was not backed up with raw data or checked against a descent profile formula. Altitude deviation altitude undershot crossing restr.
| Attributes | |
| ACN | 341996 |
| Time | |
| Date | 199607 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : sax |
| State Reference | NJ |
| Altitude | msl bound lower : 7000 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | enroute airway : v213, zbw |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : cfi pilot : flight engineer |
| Experience | flight time last 90 days : 100 flight time total : 12200 flight time type : 8500 |
| ASRS Report | 341996 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 178 flight time total : 24200 flight time type : 178 |
| ASRS Report | 342120 |
| Events | |
| Anomaly | altitude deviation : crossing restriction not met altitude deviation : undershoot non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
ZBW gave our flight a clearance to cross 25 mi north of sparta VOR at 7000 ft. Also, ZBW gave the PF a heading to intercept V213 to sparta VOR. I read back the clearance, then got on the #2 radio to get the ATIS, talk to operations, and give a PA to the passenger. When I finished my PA we were established on V213 and descending at 1000 FPM from 14000 ft MSL to 7000 ft MSL. The captain did a direct intercept using LNAV to get established on V213, but somehow got a fix bypass (25 mi north of sparta VOR), and we crossed 25 mi north of sparta at 10000 ft MSL instead of 7000 ft MSL. ZBW said 'expedite to 7000 ft MSL.' I said, 'where's the traffic?' center said, 'there's no traffic, I got to get you down for ZNY airspace.' there was never a traffic conflict. The captain and first officer failed to monitor the airplane descent. The problem could have occurred because the crew was a little tired because 2 nights earlier we were delayed 3 1/2 to 4 hours out of newark (ATC WX delays) and got to bed in cos at XA30 am. Supplemental information from acn 342120: I have flown this route before and usually use flosi intersection (30 DME) for the 7000 ft restr. I do believe the 25 NM fix was put in between flosi and crank, but I first should have had the PNF back me up on raw data, and second, back up the FMS with a 3 degree descent rate. I think from now on I will try to make the crossing restr simpler and use the fix on the route even if it is a little early. I wish ZBW would use the named fix for the 7000 ft crossing restr.
Original NASA ASRS Text
Title: FLC OF AN MLG RPT A XING RESTR DEV THAT RESULTED FROM AN FMS WAYPOINT BYPASS. THE FMS WAS NOT BACKED UP WITH RAW DATA OR CHKED AGAINST A DSCNT PROFILE FORMULA. ALTDEV ALT UNDERSHOT XING RESTR.
Narrative: ZBW GAVE OUR FLT A CLRNC TO CROSS 25 MI N OF SPARTA VOR AT 7000 FT. ALSO, ZBW GAVE THE PF A HDG TO INTERCEPT V213 TO SPARTA VOR. I READ BACK THE CLRNC, THEN GOT ON THE #2 RADIO TO GET THE ATIS, TALK TO OPS, AND GIVE A PA TO THE PAX. WHEN I FINISHED MY PA WE WERE ESTABLISHED ON V213 AND DSNDING AT 1000 FPM FROM 14000 FT MSL TO 7000 FT MSL. THE CAPT DID A DIRECT INTERCEPT USING LNAV TO GET ESTABLISHED ON V213, BUT SOMEHOW GOT A FIX BYPASS (25 MI N OF SPARTA VOR), AND WE CROSSED 25 MI N OF SPARTA AT 10000 FT MSL INSTEAD OF 7000 FT MSL. ZBW SAID 'EXPEDITE TO 7000 FT MSL.' I SAID, 'WHERE'S THE TFC?' CTR SAID, 'THERE'S NO TFC, I GOT TO GET YOU DOWN FOR ZNY AIRSPACE.' THERE WAS NEVER A TFC CONFLICT. THE CAPT AND FO FAILED TO MONITOR THE AIRPLANE DSCNT. THE PROB COULD HAVE OCCURRED BECAUSE THE CREW WAS A LITTLE TIRED BECAUSE 2 NIGHTS EARLIER WE WERE DELAYED 3 1/2 TO 4 HRS OUT OF NEWARK (ATC WX DELAYS) AND GOT TO BED IN COS AT XA30 AM. SUPPLEMENTAL INFO FROM ACN 342120: I HAVE FLOWN THIS RTE BEFORE AND USUALLY USE FLOSI INTXN (30 DME) FOR THE 7000 FT RESTR. I DO BELIEVE THE 25 NM FIX WAS PUT IN BTWN FLOSI AND CRANK, BUT I FIRST SHOULD HAVE HAD THE PNF BACK ME UP ON RAW DATA, AND SECOND, BACK UP THE FMS WITH A 3 DEG DSCNT RATE. I THINK FROM NOW ON I WILL TRY TO MAKE THE XING RESTR SIMPLER AND USE THE FIX ON THE RTE EVEN IF IT IS A LITTLE EARLY. I WISH ZBW WOULD USE THE NAMED FIX FOR THE 7000 FT XING RESTR.
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.