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An A319 captain reported inaccurate weight and balance calculations produced by the clp (central load planning) computer.
| Attributes | |
| ACN | 976407 |
| Time | |
| Date | 201110 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | A319 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 250 Flight Crew Total 13500 Flight Crew Type 1500 |
| Events | |
| Anomaly | Deviation - Procedural Weight And Balance |
Narrative:
The flight plan for our flight indicated a ZFW of 115.0 when my first officer requested the runway performance data it indicated a ZFW of 105.2 it is not unusual to have a small change in ZFW between the flight plan and runway data. However; a nearly 10;000 pound difference was significant and did not make sense considering the flight had been planned full and the passenger load had not dropped off. We requested another flight plan and runway data. Both were the same as the original documents. We called the central load planning (clp) desk working our flight and reported the error. He said they were having some problems with the system and that it was having some 'glitches.' he made some manual inputs and said to try again with the runway data. This time we got runway data that indicated 114.0; a more reasonable number with regards to our flight plan and passenger load. If the clp system is having problems this needs to be rectified immediately. Our pre-flight procedures and checks caught the error. A 10;000 pound error on the low side would have resulted in incorrect v-speeds being set on the mcdu performance page. This error would have resulted in V1/vr speeds that were approximately 5-6 KTS low. Not safe.
Original NASA ASRS Text
Title: An A319 Captain reported inaccurate weight and balance calculations produced by the CLP (Central Load Planning) computer.
Narrative: The flight plan for our flight indicated a ZFW of 115.0 When my First Officer requested the runway performance data it indicated a ZFW of 105.2 It is not unusual to have a small change in ZFW between the flight plan and runway data. However; a nearly 10;000 LB difference was significant and did not make sense considering the flight had been planned full and the passenger load had not dropped off. We requested another flight plan and runway data. Both were the same as the original documents. We called the Central Load Planning (CLP) Desk working our flight and reported the error. He said they were having some problems with the system and that it was having some 'glitches.' He made some manual inputs and said to try again with the runway data. This time we got runway data that indicated 114.0; a more reasonable number with regards to our flight plan and passenger load. If the CLP System is having problems this needs to be rectified immediately. Our pre-flight procedures and checks caught the error. A 10;000 LB error on the low side would have resulted in incorrect V-speeds being set on the MCDU Performance page. This error would have resulted in V1/Vr speeds that were approximately 5-6 KTS low. Not safe.
Data retrieved from NASA's ASRS site as of April 2012 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.