Cessna 150 Fuel Venting and Vented Caps: Applicability Research
The fuel-venting concern in the records is tied to specified U.S. 150 and A150 serial groups through 1975 production. It is associated with AD 79-10-14 R1. That scope is more precise than saying that all Cessna 150 and 152 aircraft have the same vented-cap requirement.
Identify the concern and its authority
The issue record describes fuel tank venting and vented-cap configuration. The associated directive is the next source for the controlling applicability and action. A known-issue summary is useful for finding that research path, but it does not replace the directive text or establish that an aircraft is compliant.
| Issue ID | Title | Affected Scope | Failure Mode | Detection / Prebuy Clues | Legal / OEM Status | Conditional Applicability Rule | Reference |
|---|---|---|---|---|---|---|---|
| KI-017 | Fuel tank venting / vented cap configuration | Specified U.S. 150/A150 serial groups through 1975 production per AD 79-10-14 R1. | Insufficient/incorrect venting can reduce fuel flow or create tank pressure imbalance. | Verify approved vented cap/vent configuration and AD terminating action; inspect vent tube/cap condition. | FAA AD - mandatory | None | [1] |
Cap appearance is incomplete evidence
For an aircraft review, establish the installed tank and cap configuration and the relevant maintenance history. A photograph or a broad parts description can leave the exact identity unresolved. Likewise, a logbook statement about a fuel-system inspection may not say whether the directive's particular subject was addressed.
The fuel-system overview places venting alongside supply lines, drains, strainer and indication. These are separate functions. A satisfactory quantity indication does not establish the condition of venting, and a capacity figure does not establish the cap installation.
Keep family and serial boundaries intact
Do not extend the recorded U.S. serial scope to Reims aircraft merely because the models have related names. Conversely, absence from this narrow issue entry is not a complete assessment of every requirement applicable to an aircraft's fuel system. It is only the boundary of this research item.
Use the serial-number guide to resolve identity, then match the controlling publication and aircraft records. The prebuy guide provides the broader process for recording findings and unresolved evidence. This page makes no determination about current airworthiness or completion of the required action.
How to record an unresolved match
A useful research note identifies the aircraft serial, the directive revision under review and the missing configuration or action evidence. That is more precise than marking the aircraft simply affected or unaffected from a broad list. The qualified reviewer can then resolve the specific question against the controlling text and the actual installation, while preserving a traceable reason for the final determination.