Weight and balance
Weight and balance transaction readiness review for MRO teams
This review confirms that the weight and balance file an MRO hands over will stand up when a buyer, lessor, or lender reads it. A records specialist works through weighing reports, equipment change entries, and amendment history while the aircraft is still in the shop, then reconciles each figure to the current weight and balance statement. Any change to installed equipment that moved weight without a supported amendment is flagged with the exact document needed to fix it. The MRO exits the check with a defensible statement, a short exception list, and closure actions sequenced before commercial sign-off.
When this review is needed
- A heavy check is closing out and the aircraft goes straight from the hangar into a sale or lease return.
- Equipment was added or removed during the visit and the amendment trail has not been checked against the statement.
- The operator's last reweigh is near its program limit and the counterparty will ask how current the figures are.
- A financing review has requested the weight and balance file and nobody has read it end to end recently.
The problem
During a shop visit the weight and balance file changes in small increments: an avionics unit out, a galley insert in, ballast adjusted, each with its own paperwork. The statement is usually updated last, under time pressure, and the arithmetic behind it lives across task cards and equipment change forms. When a transaction team then asks for the basis of the current empty weight and center of gravity, the MRO has to reconstruct the chain on the spot.
What gets reviewed
- The current weight and balance statement and the revision history behind it
- Weighing reports, including the equipment configuration recorded at each weighing
- Equipment change and ballast entries generated during the shop visit
- Amendments driven by modifications, STC embodiments, and interior changes
- Loading documents and any operator-specific weight and balance program requirements
- Cross-references between task cards that moved weight and the amendment record
Scope this review
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What gets validated
- Every equipment change with a weight effect has a matching amendment or a computed revision to the statement
- The empty weight and center of gravity on the statement recompute correctly from the last weighing plus subsequent amendments
- The configuration listed on the most recent weighing report matches what the aircraft actually carried at that weighing
- Reweigh timing satisfies the operator program and any lease or purchase agreement condition
- Signatures, dates, and approval references on amendments meet 14 CFR 43 and Part-M entry requirements
Evidence normally required
- Current weight and balance statement with its full revision history
- All weighing reports available for the aircraft, oldest to newest
- Equipment change forms and ballast records from the current and prior visits
- Modification and STC records with their weight and moment data
- The operator's weight and balance program or exposition extract
Common discrepancies
- An interior change embodied mid-visit with no corresponding statement revision
- A statement that carries forward a computed weight after the program required an actual reweigh
- Amendment arithmetic that no longer reconciles to the last weighing report
- Equipment change forms signed off without the weight and moment values needed to compute the amendment
What is at stake
A statement that cannot be walked back to weighing reports and amendment entries becomes a negotiation item. Buyers discount, lessors write technical acceptance conditions, and lenders hold funds until the figures are substantiated. If the gap surfaces after redelivery, the MRO is answering for it without access to the aircraft or the shop paperwork.
Move from findings to resolution
Move from findings to a documented resolution path.
How the work runs
Assemble the chain
Pull the statement, every weighing report, and all amendment and equipment change records into one dated set.
Recompute and compare
Rebuild empty weight and center of gravity from the last weighing forward and compare against the current statement.
Trace shop-visit changes
Match every task card and modification with a weight effect to its amendment entry.
Report and sequence closure
Issue the exception register with responsible parties and a closure order that fits the transaction timeline.
What the buyer receives
- An exception register listing each unsupported figure with the document that closes it
- A reconciliation worksheet from the last weighing through every amendment to the current statement
- A closure sequence agreed with the MRO before the transaction date
Who uses the output
- MRO program managers signing the aircraft out of the visit
- Quality leads answering counterparty questions during technical acceptance
- Records controllers updating the statement file before the data room opens
How the work fits into the transaction or program
The check slots between shop-visit closeout and commercial handover. Findings feed the MRO's own certification of work performed, and the reconciled statement becomes part of the delivery bible the transaction team assembles, so the weight and balance chapter closes before the buyer or lessor starts asking.
Jurisdiction-specific considerations
FAA and EASA both require maintenance entries for changes affecting weight and balance, but the mechanics differ. Under 14 CFR 43 the amendment rides on the maintenance record entry, while EASA operators typically manage revisions through an approved weight and balance program in the exposition, with reweigh intervals set there. A cross-registry transaction has to satisfy the stricter reading of both.
Regulatory limits
The review verifies documentation, nothing more. It does not weigh the aircraft, approve amendments, issue or sign any maintenance release, or determine airworthiness. Corrections to the statement remain the responsibility of appropriately authorized personnel under the applicable regulation.
What this review does not cover
- Physical weighing or leveling of the aircraft
- Preparation or approval of new weight and balance amendments
- Loading system or performance software validation
Specific to this review
- Weight and balance gaps concentrate at shop visits because interior and avionics changes cluster there while the statement update waits for closeout.
- A computed statement is only as strong as the oldest weighing it chains from; long amendment chains are a standard buyer challenge.
- Ballast entries are the most commonly orphaned weight records because they are often handled as expendable hardware rather than configuration changes.
- Transaction teams read reweigh currency against the lease or purchase agreement first and the operator program second, and the two do not always agree.
Sources
U.S. Government (eCFR). Maintenance recordkeeping content and approval-for-return-to-service requirements, including 43.9, 43.11, and Appendix B.
U.S. Government (eCFR). Records an owner or operator must keep, including total time in service, current status of life-limited parts, and AD compliance.
European Union / EASA. Continuing airworthiness, maintenance records, CAMO responsibilities, and the airworthiness review process in the EASA system.
Frequently asked questions
Can the review run while the aircraft is still in the check?
Yes, and that is the best time. Most exceptions are cheapest to close while the shop paperwork is still open and the people who signed the entries are on site. Once the visit closes, every correction becomes a formal records action.
Relevant glossary terms
Related pages
Where this fits
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