Lycoming T5311B
2 aircraft on the U.S. register carry a Lycoming T5311B engine, rated at about 1100 horsepower. The Bell 204 is the model most often fitted with it (2 aircraft). The aircraft carrying it were built between 1965 and 1967.
The FAA records engines by code, usually at the level of a series ("O-320 series") rather than the exact variant; this page gathers every FAA code that reads as Lycoming T5311B. FAA spelling: T5311B.
What the FAA has certified, ordered and been told about the Lycoming T5311B the component layer
No FAA order in the current files names this engine series. Operators and repair shops have filed 35 failure reports with the FAA since 1995, 6 of them in the last ten years.
Failure reports 35 since · what operators and shops told the FAA
Failure reports by year, as a table
| reports | |
|---|---|
| 96 | 1 |
| 97 | 1 |
| 98 | 4 |
| 99 | 3 |
| 00 | 2 |
| 01 | 1 |
| 02 | 1 |
| 03 | 6 |
| 05 | 5 |
| 06 | 1 |
| 07 | 2 |
| 08 | 1 |
| 09 | 1 |
| 11 | 3 |
| 13 | 2 |
| 19 | 1 |
Parts most often reported as the reports name them
Parts most reported, as a table
| reports | |
|---|---|
| Blade | 3 |
| Bolt | 3 |
| Longeron | 3 |
| Nut | 3 |
| Housing | 2 |
| Panel | 2 |
| Bearing | 1 |
| Bellcrank | 1 |
| Bulkhead | 1 |
| Cap Angle | 1 |
Latest reports
Approved replacement parts 19 parts manufacturer approvals
Parts a company other than the maker may make for this engine and sell as FAA-approved. The companies holding the most:
Most often: clamp (14), gearshaft helical (2), nozzle (1), gear (1), cup (1).
Sources: the FAA's type certificate data sheets, airworthiness directives, supplemental type certificates, special conditions and special airworthiness information bulletins (Dynamic Regulatory System), and the FAA's service difficulty reports. A failure report is what an operator or repair station chose to file; the counts show reporting as much as reliability, and larger and commercial fleets report more. How the systems are grouped.
Connections how this engine series links to the rest of the register
- Bell 204 2 with this engine series
- Alaska 2 of these aircraft
- Failure reports on the Lycoming T5311B 35 reports since 1995
The whole map of how records connect · these connections as data: /graph/engine/lycoming-t5311b.json.
Aircraft newest certificates first · 2
| Tail no. | Maker and model | Group | Owner and base | Certificate | Registered | Status |
|---|---|---|---|---|---|---|
| N204RA | Bell 204-B |
Rotorcraft | Rotak LLC Anchorage, Alaska |
Standard | 2025-12-31 | ValidFAA registration status code V: Valid registration. All codes |
| N67FU | Bell 204-B |
Rotorcraft | Rotak LLC Anchorage, Alaska |
Standard | 2025-12-30 | ValidFAA registration status code V: Valid registration. All codes |
Source: FAA Civil Aviation Registry, Releasable Aircraft Database (the engine reference table and each aircraft's engine code), October 27, 2026. Horsepower and thrust are the FAA's figures for the series, not for a particular aircraft.