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B737-800 flight crew expressed frustration with altitude and speed restr inbound to sfo.
| Attributes | |
| ACN | 591449 |
| Time | |
| Date | 200308 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | intersection : cepes |
| State Reference | CA |
| Altitude | msl single value : 24000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach descent : intermediate altitude |
| Route In Use | arrival star : modesto 2 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : flight engineer pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 240 flight time total : 14500 flight time type : 500 |
| ASRS Report | 591449 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : commercial pilot : flight engineer pilot : instrument pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 29000 flight time type : 1500 |
| ASRS Report | 591449 |
| Events | |
| Anomaly | altitude deviation : crossing restriction not met non adherence : clearance |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : executed go around |
| Supplementary | |
| Problem Areas | Aircraft ATC Human Performance Flight Crew Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Inter Facility Coordination Failure |
Narrative:
Aircraft X was on the modesto 2 arrival into sfo. We were approximately 20 NM east of cedes intersection at FL240. ZOA told us to cross cedes intersection at 11000 ft and maintain 300 KTS or better. We were not able to make cedes intersection crossing altitude because of the altitude we had to lose and the airspeed constraint of 300 KTS or greater. Approaching cedes intersection we advised ZOA we were not going to be able to make the altitude restr at cedes intersection. Shortly before reaching cedes intersection, ZOA cleared us to 7000 ft. ATC has to plan better and understand it is impossible to meet both altitude and airspeed in such a short distance with a B737-800 aircraft. Especially with a speed restr as we were unable to utilize speed brakes to get down because of an aircraft airspeed limitation. Because of all of this we ended up way too high for the approach to runway 28R and then at the last min they switched us to runway 28L and we had to execute a missed approach and come back and land. Trying to program and reprogram the FMC, fly the airplane, go down and slow down and watch for traffic gets to be an enormous workload for us at a critical time. Fortunately there were no conflicts with other aircraft this time.
Original NASA ASRS Text
Title: B737-800 FLT CREW EXPRESSED FRUSTRATION WITH ALT AND SPD RESTR INBOUND TO SFO.
Narrative: ACFT X WAS ON THE MODESTO 2 ARR INTO SFO. WE WERE APPROX 20 NM E OF CEDES INTXN AT FL240. ZOA TOLD US TO CROSS CEDES INTXN AT 11000 FT AND MAINTAIN 300 KTS OR BETTER. WE WERE NOT ABLE TO MAKE CEDES INTXN XING ALT BECAUSE OF THE ALT WE HAD TO LOSE AND THE AIRSPD CONSTRAINT OF 300 KTS OR GREATER. APCHING CEDES INTXN WE ADVISED ZOA WE WERE NOT GOING TO BE ABLE TO MAKE THE ALT RESTR AT CEDES INTXN. SHORTLY BEFORE REACHING CEDES INTXN, ZOA CLRED US TO 7000 FT. ATC HAS TO PLAN BETTER AND UNDERSTAND IT IS IMPOSSIBLE TO MEET BOTH ALT AND AIRSPD IN SUCH A SHORT DISTANCE WITH A B737-800 ACFT. ESPECIALLY WITH A SPD RESTR AS WE WERE UNABLE TO UTILIZE SPD BRAKES TO GET DOWN BECAUSE OF AN ACFT AIRSPD LIMITATION. BECAUSE OF ALL OF THIS WE ENDED UP WAY TOO HIGH FOR THE APCH TO RWY 28R AND THEN AT THE LAST MIN THEY SWITCHED US TO RWY 28L AND WE HAD TO EXECUTE A MISSED APCH AND COME BACK AND LAND. TRYING TO PROGRAM AND REPROGRAM THE FMC, FLY THE AIRPLANE, GO DOWN AND SLOW DOWN AND WATCH FOR TFC GETS TO BE AN ENORMOUS WORKLOAD FOR US AT A CRITICAL TIME. FORTUNATELY THERE WERE NO CONFLICTS WITH OTHER ACFT THIS TIME.
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.