Cessna 150 Battery Relocation: Elevator-Cable Interference Research
An aft battery relocation on a Cessna 150 can create a flight-control research question as well as an electrical and weight-and-balance question. The retained issue record describes possible interference or damage involving the elevator-up cable on listed 150, A150 and Reims variants when the battery has been moved aft by modification. The condition is the relocation installation, not simply the aircraft model.
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A modification with several interfaces
Moving a battery changes where a substantial installed item and its associated cabling are located. The source concern specifically connects that changed installation with the elevator cable. A review confined to battery condition or charging performance would therefore miss the stated interaction with flight controls.
| Reference family | Issue ID | Category | Title | Failure Mode | Affected Scope | Applicability Class | Severity | Operational Consequence | Detection / Prebuy Clues | Maintenance / Mitigation | Legal / OEM Status | Primary Source Ref | Reference | Prebuy Priority | Confidence | Notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cessna 150 | KI-037 | STC / Flight Controls | Battery relocation interference with elevator cable | Aft-relocated battery/cable installation can interfere with or damage elevator-up cable. | Listed 150/A150/F150/FA150/FRA150 only when battery relocated aft by modification. | STC / CONFIGURATION | CRITICAL | Elevator control interference/damage. | Inspect modification records, routing/securing and elevator cable condition. | Correct routing/secure cable and comply with AD 88-15-06. | FAA AD - mandatory conditional | AD 88-15-06 | [1] | CRITICAL | HIGH | Configuration-dependent. |
The record points to AD 88-15-06 and retains its modification-dependent scope. It does not establish that every engine conversion moves the battery, that every aft battery installation is affected, or that every aircraft eligible for a conversion has received it. The engine-conversion reference explains why those assumptions must be kept separate.
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Establish what was actually moved
Start with the alteration records and equipment list. Identify the described battery location, the modification under which it was moved and any later changes to the installation. A subsequent engine replacement does not necessarily explain the battery arrangement, and an old relocation entry may have been followed by another alteration.
Bring those records to the inspection so the routing and securing of the actual installation can be compared with the applicable instructions. This article does not specify a routing path, clearance value or repair method. The local summary supports the question to investigate; the approved installation and maintenance information must supply the detail.
Weight-and-balance evidence remains necessary
The location change also belongs in the aircraft's weight-and-balance history. An updated empty-weight report can help describe the loading consequences, but it is not evidence that a cable-interference concern was inspected. Conversely, a control-cable inspection entry does not substitute for an updated equipment and loading record.
Use the Cessna 150 weight-and-balance reference for the original configuration context, then establish how the individual aircraft's documented alteration changes it. Do not substitute a factory empty-weight example for the modified aircraft's current figures.
A focused prebuy question
Instead of asking only whether the aircraft has “all ADs complied with,” ask which records identify the battery relocation and address the relevant cable interaction. That question gives the inspecting mechanic a defined installation to trace. If the records do not establish whether the battery was relocated under an affected arrangement, leave applicability unresolved pending inspection and reference. A source-table match is a lead for that work, not proof of installation, compliance or present control-system condition.