AD 58-01-03
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Kelowna Flightcraft R & D Ltd. | 340 | CONVAIR Model 440 and 340 Aircraft |
| aircraft | Kelowna Flightcraft R & D Ltd. | 440 | CONVAIR Model 440 and 340 Aircraft |
Unsafe Condition
The PR-58E5-17 carburetor setting has an undesirable leaning tendency, resulting in potential power loss in the high power range when metering on the rich side of allowable limits.
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Required Actions
Modify the PR-58E5-17 carburetor setting to the PR-58E5-29 setting per Bendix Service Bulletin No. 820, revise Airplane Flight Manuals with Convair Service Bulletins 340-144A and 440-58, and mark the Auto-Lean mixture control position clearly.
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Compliance Time
by first engine overhaul after March 1, 1958, but not later than October 1, 1958
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Affected Aircraft
CONVAIR Model 440 serial numbers 312 through 420 and all Model 340 with Model 440 nacelles, equipped with PR-58E5-17 carburetors in P&W Double Wasp CB16 and 17 engines.
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Federal Register Abstract
Carburetor Setting
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_58-01-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 58-01-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: CONVAIR Model 440 and 340 Aircraft Subject: Carburetor Setting Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Kelowna Flightcraft R & D Ltd. Model: 340 | 440 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 58-01-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 58-01-03 SUBJECT HEADING: CONVAIR Model 440 and 340 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 58-01-03 CONVAIR: Applies to the Following Aircraft Equipped With PR-58E5-17 Carburetors in P&W Double Wasp CB16 and 17 Engines; Model 440 Serial 312 Through 420 and All Model 340 With Model 440 Nacelles. Compliance required by first engine overhaul after March 1, 1958, but not later than October 1, 1958. The PR-58E5-17 carburetor setting originally provided in the aircraft has an undesirable leaning tendency. To overcome this deficiency the PR-58E5-29 carburetor setting has been developed and must be incorporated in the above aircraft. Normal fuel metering in carburetors incorporating the PR-58E5-29 "Transport Setting" may result in powers lower than those employed for aircraft certification. This occurs in the high power range with the control in the Auto-Rich position in cases where the carburetor meters on the rich side of the allowable limits. The amount of power loss will vary with different carburetors. Performance information in the FAA approved Airplane Flight Manual is based upon the maximum certificated power ratings of the engine. To obtain full rated power at manifold pressure limits for maximum continuous power, it is necessary to adjust the fuel mixture by the mixture control (takeoff power is not adversely affected by use of the full rich mixture position). (P&WA Engine Operation Information Letter No. 28 covers this subject in further detail.) In order to insure obtaining the power used in aircraft certification, accomplish the following: 1. For MC power during one-engine out operation use Auto-Lean mixture setting. Insert revised pages in the pertinent Airplane Flight Manuals in accordance with Convair Service Bulletins Nos. 340-144A and 440-58. 2. Modify the PR-58E5-17 carburetor setting to the PR-58E5-29 carburetor setting in accordance with Bendix Aircraft Carburetor Service Bulletin No. 820. 3. The Auto-Lean mixture control position should be plainly marked and identified. FOOTER:
Document Text
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AD Final Rules - DRS_58-01-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 58-01-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: CONVAIR Model 440 and 340 Aircraft Subject: Carburetor Setting Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Kelowna Flightcraft R & D Ltd. Model: 340 | 440 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: 58-01-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 58-01-03 SUBJECT HEADING: CONVAIR Model 440 and 340 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 58-01-03 CONVAIR: Applies to the Following Aircraft Equipped With PR-58E5-17 Carburetors in P&W Double Wasp CB16 and 17 Engines; Model 440 Serial 312 Through 420 and All Model 340 With Model 440 Nacelles. Compliance required by first engine overhaul after March 1, 1958, but not later than October 1, 1958. The PR-58E5-17 carburetor setting originally provided in the aircraft has an undesirable leaning tendency. To overcome this deficiency the PR-58E5-29 carburetor setting has been developed and must be incorporated in the above aircraft. Normal fuel metering in carburetors incorporating the PR-58E5-29 "Transport Setting" may result in powers lower than those employed for aircraft certification. This occurs in the high power range with the control in the Auto-Rich position in cases where the carburetor meters on the rich side of the allowable limits. The amount of power loss will vary with different carburetors. Performance information in the FAA approved Airplane Flight Manual is based upon the maximum certificated power ratings of the engine. To obtain full rated power at manifold pressure limits for maximum continuous power, it is necessary to adjust the fuel mixture by the mixture control (takeoff power is not adversely affected by use of the full rich mixture position). (P&WA Engine Operation Information Letter No. 28 covers this subject in further detail.) In order to insure obtaining the power used in aircraft certification, accomplish the following: 1. For MC power during one-engine out operation use Auto-Lean mixture setting. Insert revised pages in the pertinent Airplane Flight Manuals in accordance with Convair Service Bulletins Nos. 340-144A and 440-58. 2. Modify the PR-58E5-17 carburetor setting to the PR-58E5-29 carburetor setting in accordance with Bendix Aircraft Carburetor Service Bulletin No. 820. 3. The Auto-Lean mixture control position should be plainly marked and identified. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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