Date: 202107
Local time of day: 1201-1800
Location: ZZZ.Airport, US
Flight conditions: VMC
Aircraft: B767-300 and 300 ER
Operator: Air Carrier
Mission: Cargo / Freight / Delivery
Aircraft component: Cabin Furnishing
Component problem: Improperly Operated
Reporter organization: Air Carrier
Reporter function: Inspector
Reporter qualification: Maintenance Airframe; Maintenance Powerplant
Human factors: Time Pressure; Communication Breakdown; Situational Awareness; Workload
Anomaly: Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Weight And Balance; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural FAR
Detector: Person Maintenance
When detected: Routine Inspection
Result: General Maintenance Action
Contributing factors: Human Factors; Environment - Non Weather Related; Aircraft
Primary problem: Human Factors

Narrative: This event involved a Crew Rest Module (CRM) change from Aircraft X to Aircraft Y.  This is a common maintenance task that occurs when 767s are flown internationally. The process is controlled and documented by EO (Engineering Order) XXXXXX Part 1 CRM loaded ON aircraft and EO XXXXXXX Part 2 CRM removal. The EO affects the weight and balance and requires the BOW (Basic Operating Weight) to be changed before flight when the CRMs are installed or removed. The AMT is responsible for all maintenance actions. Once the changes are made he has to bring the paperwork to QC so that we can initiate the BOW change through [Flight Info]. [Flight Info] in turn contacts systems Engineering who makes the required BOW change in the computer weight and balance system. Once the BOW has been changed an e-mail is sent to [Flight Info] and QC (Quality Control) so that the paperwork can be stamped by QC indicating this step has been complied with. The paperwork is then returned to Maintenance and the EO and associated [Maintenance Release] can be signed off by the AMT.  Engineering often takes several hours to make these changes so the paperwork often gets stamped by an inspector who did not initiate the BOW. On this event the AMT brought the paperwork to QC at approx XA:50 am. I started the scanning procedure and e-mail notice was sent to [Flight Info] at XB:12. I received the confirmation notice from [Flight Info] at XB:23. I notified the other Inspectors in the office of the BOW change requirements and that the paperwork was my desk. At some point I was called out to another aircraft for an inspection that I thought would take extended time to comply with. I gave the EO work cards to another inspector on duty. After I returned from the Inspection; the time was close to XC:30 which is clock out time for QC day shift. Just before I left for the day a swing shift Inspector asked about the CRM change paperwork. I was somewhat surprised that it had not been completed at this point. The paperwork was still on the inspectors desk that I had given it to nearly 3 hours earlier. Swing shift came in to a very busy day with many inspections; and several complex jobs to take care of so I checked and saw that an e-mail had just been sent notifying that the BOW had been changed. I stayed and tried to help out by taking care of the BOW weight issue. The e-mail was sent at XC:27 that the BOW Change was completed. I thought the e-mail addressed the BOW change for both Aircraft X and Y. I stamped the paperwork for both aircraft and notified the AMT that he could pick up the paperwork in the QC office. The mistake in this event is that I did not read the e-mail closely enough to insure that the BOW change included both aircraft. The original e-mail I sent to [Flight Info] initiating the process included info for both Aircraft X and Y. So I thought the reply was for both Aircraft. If I had noticed this I would have only stamped the E.O. for Aircraft X and not Y. Although the BOW was changed in the computer before the aircraft departed for flight; the mistake could have resulted in an improper BOW listed for the weight and balance computation. I have to slow down; read and understand the e-mail notification. Also it would be nice if we could get timely updates from Systems Engineers on the BOW changes. This one took in excess of 5 hours.




Synopsis: 767-300 Inspector reported not ensuring completion of required paperwork to correctly identify Basic Operating Weight changes on two aircraft involved in a crew rest module swap.