Weight and balance
Weight and balance records review for the redelivery binder
The weight and balance statement in a redelivery binder is a computed claim, and this review checks the computation back to its sources. A reviewer takes the current statement and traces it to the last physical weighing report, then forward through every amendment: equipment changes, cabin reconfigurations, and modifications that added or removed mass. It is performed for lessors or returning operators while the binder is in preparation. The result is a verdict on whether the stated empty weight and center of gravity are reproducible from the enclosed records, with each unsupported amendment identified.
When this review is needed
- The cabin was reconfigured during the lease, seats, galleys, or connectivity hardware, and the statement has been amended by computation ever since.
- The last physical weighing predates the lease and the amendment chain from it has never been independently added up.
- Return conditions or the incoming operator's procedures require a fresh weighing, and the parties disagree about whether the records justify one.
- Modification and de-modification work near the return date changed mass and moment, and the statement must catch up before acceptance.
The problem
Weight and balance drifts by paperwork. After a weighing, every change to the aircraft is supposed to enter the record as a computed amendment, and over a long lease those amendments number in the dozens, prepared by different engineers from different data sources. One amendment computed from a vendor's estimated weight instead of actual, one equipment change that never reached the log, one modification whose moment arm was taken from the wrong station diagram, and the statement quietly detaches from the aircraft. The document still looks precise; the precision is the problem.
What gets reviewed
- Trace of the current statement to the most recent physical weighing report and its equipment condition at weighing
- Recomputation of the amendment chain from that weighing to the redelivery statement
- Verification that every weight-affecting modification and equipment change in the binder appears in the amendment record
- Review of the data sources behind amendment entries, actual versus estimated weights and documented moment arms
- Consistency check between the statement date, the equipment list, and the cabin configuration being returned
- Assessment against any reweigh triggers in the operator's program or the lease's return conditions
Scope this review
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What gets validated
- The weighing report is complete, identifies the configuration weighed, and its figures carry through as the amendment chain's starting point
- Summed amendments reproduce the current empty weight and center of gravity within rounding, with no unexplained adjustments
- Each amendment cites its source document, and sampled sources confirm the weights and arms used
- Weight-affecting entries in the modification status and equipment change log all have corresponding amendments
- The statement in the binder reflects the configuration at redelivery, including any late de-modification
Evidence normally required
- The current weight and balance statement and the operator's amendment log
- The last physical weighing report and the equipment inventory recorded at weighing
- Equipment change records and the modification status for the lease term
- Manufacturer or design-holder weight data cited by amendments
- The operator's weight-control program requirements and the lease's return conditions
Common discrepancies
- An amendment chain that does not arithmetically reproduce the current statement, usually from a transcription error propagated for years
- Cabin reconfigurations documented in engineering records with no corresponding weight amendment anywhere
- Amendments built on estimated or catalog weights where the program required actual weighed values
- A statement current to a configuration that late de-modification work has already changed
What is at stake
An unsupportable statement forces a reweigh, and a reweigh at redelivery is a scheduling problem as much as a cost: it needs a hangar, calibrated equipment, a defueled and configured aircraft, and a slot in a timeline that has none spare. If discrepancies surface after transfer instead, the incoming operator inherits performance calculations built on a wrong basis, which becomes a compliance issue on their certificate rather than a records dispute on the lease.
Move from findings to resolution
Move from findings to a documented resolution path.
How the work runs
Anchor at the weighing
Validate the last physical weighing report and fix it as the computational baseline.
Recompute the chain
Sum every amendment forward from the weighing and compare against the current statement.
Test amendments at source
Check sampled amendments against the documents that supplied their weights and arms.
Conclude and recommend
Deliver the verdict, the gap list, and a supported position on the reweigh question.
What the buyer receives
- A traceability verdict on the statement with the full amendment recomputation attached
- An unsupported-amendment list naming the missing source document for each entry
- A reasoned position on whether the records justify accepting the statement or commissioning a reweigh
Who uses the output
- Lessor technical representatives deciding whether to demand a reweigh in acceptance negotiations
- The returning operator's weight-control engineer curing amendment gaps
- Incoming-operator performance engineers who will build load and trim data on these figures
How the work fits into the transaction or program
Weight and balance sits downstream of the modification and equipment-list reviews, because those record classes generate the changes this statement must have absorbed. In a full binder program it is scheduled after both, letting the reviewer test the amendment record against an already-verified change population instead of discovering the changes and the amendments simultaneously.
Jurisdiction-specific considerations
FAA operators carry weight and balance duties through 14 CFR Part 43 alteration records and their operations specifications, while EASA operators manage them under continuing-airworthiness provisions of Regulation (EU) 1321/2014, commonly with periodic reweigh intervals set by the approved program. Reweigh philosophy differs enough between regimes that a statement maintained validly by computation under one authority can still fail the incoming operator's program on the other side.
Regulatory limits
The review addresses whether the records support the stated figures. It does not perform or witness weighings, does not produce amendments or load data, and makes no determination of operational compliance; weighing decisions and performance data remain with the operators and their approved programs.
What this review does not cover
- Conducting a physical aircraft weighing
- Preparing new weight and balance amendments or load sheets
- Evaluating loading systems or operational weight and balance procedures
Specific to this review
- Amendment chains fail arithmetically more often than conceptually; a single digit transposed early in the lease propagates through every later statement and only a full recomputation catches it.
- Estimated versus actual weight is the quiet defect: vendor documentation often ships with catalog weights, and an amendment built on them can sit outside program rules without looking wrong.
- Reweigh triggers based on cumulative change since last weighing are easy to trip unnoticed, since no single amendment crosses the line but the sum does.
- The statement, the equipment list, and the modification status must describe the same aircraft on the same date, and acceptance auditors read all three together for exactly that reason.
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
The amendment chain reproduces the statement. Can the aircraft still need a reweigh?
Yes, on two grounds. The chain can be internally consistent while resting on estimated weights or undocumented changes, which is why sampled amendments are traced to source. Separately, the operator's program or the incoming operator's requirements may impose a reweigh on elapsed time or cumulative change regardless of how clean the arithmetic is.
Relevant glossary terms
Related pages
Where this fits
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