AD 56-18-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Kelowna Flightcraft R & D Ltd. | 340 | CONVAIR Model 340 Aircraft |
Unsafe Condition
Engines installed in Convair 340 airplanes may experience excessive oil temperatures and inability to scavenge the crankcase during hot weather operations due to high oil flow rates.
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Required Actions
Comply with Pratt & Whitney Service Bulletins Nos. 1513 and 1524, or adopt maintenance practices and engine overhaul procedures that effectively reduce oil flow rates.
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Compliance Time
Preferably at next engine overhaul but not later than June 1, 1957.
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Affected Aircraft
Convair Model 340 Aircraft, all serial numbers.
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Federal Register Abstract
Crankcase
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_56-18-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 56-18-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: CONVAIR Model 340 Aircraft Subject: Crankcase Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Kelowna Flightcraft R & D Ltd. Model: 340 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 56-18-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 56-18-02 SUBJECT HEADING: CONVAIR Model 340 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 56-18-02 CONVAIR: Applies to All 340 Aircraft. Compliance required preferably at next engine overhaul but not later than June 1, 1957. Due to the possibility in hot weather operation that the engines installed in Convair 340 airplanes can experience excessive oil temperatures and inability to scavenge the crankcase, Pratt & Whitney Aircraft Service Bulletins Nos. 1513 and 1524 shall be accomplished as indicated above. This serious condition, which has been experienced in hot weather on several occasions by two scheduled airline operators, is attributed mainly to high oil flow rates, which will be effectively reduced by compliance with these Pratt & Whitney Service Bulletins. (Air Carrier Maintenance Alert Bulletin No. 241 also deals with this subject.) As an alternate to compliance with these bulletins, the adoption of maintenance practices and engine overhaul procedures which effectively reduce oil flow rates will be acceptable. FOOTER:
Document Text
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AD Final Rules - DRS_56-18-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 56-18-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: CONVAIR Model 340 Aircraft Subject: Crankcase Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Kelowna Flightcraft R & D Ltd. Model: 340 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 56-18-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 56-18-02 SUBJECT HEADING: CONVAIR Model 340 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 56-18-02 CONVAIR: Applies to All 340 Aircraft. Compliance required preferably at next engine overhaul but not later than June 1, 1957. Due to the possibility in hot weather operation that the engines installed in Convair 340 airplanes can experience excessive oil temperatures and inability to scavenge the crankcase, Pratt & Whitney Aircraft Service Bulletins Nos. 1513 and 1524 shall be accomplished as indicated above. This serious condition, which has been experienced in hot weather on several occasions by two scheduled airline operators, is attributed mainly to high oil flow rates, which will be effectively reduced by compliance with these Pratt & Whitney Service Bulletins. (Air Carrier Maintenance Alert Bulletin No. 241 also deals with this subject.) As an alternate to compliance with these bulletins, the adoption of maintenance practices and engine overhaul procedures which effectively reduce oil flow rates will be acceptable. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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