AD 57-12-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Kelowna Flightcraft R & D Ltd. | 340 | CONVAIR Model 340 Aircraft |
Unsafe Condition
Cracks occurring in the spar of the left-hand elevator in the area of the cutouts for the tab controls, originating near the bolts attaching the support bracket for the tab control idler and extending to a corner of the spar cutouts. Cracks also reported in angles P/N 340-2210114-10 and -111 above and below the spar openings.
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Required Actions
Inspect the left-hand elevator spar for cracking near the tab control idler attachment bolts and spar cutouts. Repair cracks before next flight if found. Reinforce the spar vicinity of the tab control idler attachment using Convair Service Airgram No. 212 sections 8 and 9, regardless of crack presence.
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Compliance Time
As soon as possible but not later than the next 100 hours of operation unless already accomplished and at each 250 hours of operation thereafter.
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Affected Aircraft
All Model 340 Aircraft.
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Federal Register Abstract
Elevator Main Spar
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_57-12-05.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 57-12-05 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: CONVAIR Model 340 Aircraft Subject: Elevator Main Spar 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 Model: 340 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 57-12-05 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 57-12-05 SUBJECT HEADING: CONVAIR Model 340 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 57-12-05 CONVAIR: Applies to All Model 340 Aircraft. Compliance as indicated below. Several reports have been received of cracks occurring in the spar of the left-hand elevator in the area of the cutouts for the tab controls. The cracks originated in the area of the bolts that attach the support bracket for the tab control idler to the spar and in some cases, the cracks extend to a corner of one of the spar cutouts. Reports also indicate that the two angles P/N 340-2210114-10 and -111 above and below the spar openings have been cracked. 1. Compliance required as soon as possible but not later than the next 100 hours of operation unless already accomplished and at each 250 hours of operation thereafter. Inspect the left-hand elevator spar for cracking as described above. If cracks are found, they shall be repaired before the next flight. (Convair "Service Airgram" No. 212, dated March 15, 1957, sections 1 through 7 illustrate a satisfactory means of repairing cracks in the elevator main spar.) 2. The special inspection period specified in item 1 may be discontinued and the regular inspection periods resumed after the following is accomplished: (a) Repair of all cracks found during the inspection of the left-hand elevator spar as indicated in item 1. (b) Reinforce the elevator spar in the vicinity of the tab control idler attachment. A satisfactory means of reinforcing the elevator spar is described in sections 8 and 9 of Convair "Service Airgram" No. 212. Reinforcement to be accomplished regardless of whether or not cracks are found. FOOTER:
Document Text
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AD Final Rules - DRS_57-12-05.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 57-12-05 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: CONVAIR Model 340 Aircraft Subject: Elevator Main Spar 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: 57-12-05 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 57-12-05 SUBJECT HEADING: CONVAIR Model 340 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 57-12-05 CONVAIR: Applies to All Model 340 Aircraft. Compliance as indicated below. Several reports have been received of cracks occurring in the spar of the left-hand elevator in the area of the cutouts for the tab controls. The cracks originated in the area of the bolts that attach the support bracket for the tab control idler to the spar and in some cases, the cracks extend to a corner of one of the spar cutouts. Reports also indicate that the two angles P/N 340-2210114-10 and -111 above and below the spar openings have been cracked. 1. Compliance required as soon as possible but not later than the next 100 hours of operation unless already accomplished and at each 250 hours of operation thereafter. Inspect the left-hand elevator spar for cracking as described above. If cracks are found, they shall be repaired before the next flight. (Convair "Service Airgram" No. 212, dated March 15, 1957, sections 1 through 7 illustrate a satisfactory means of repairing cracks in the elevator main spar.) 2. The special inspection period specified in item 1 may be discontinued and the regular inspection periods resumed after the following is accomplished: (a) Repair of all cracks found during the inspection of the left-hand elevator spar as indicated in item 1. (b) Reinforce the elevator spar in the vicinity of the tab control idler attachment. A satisfactory means of reinforcing the elevator spar is described in sections 8 and 9 of Convair "Service Airgram" No. 212. Reinforcement to be accomplished regardless of whether or not cracks are found. FOOTER:
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Retrieved: Apr 8, 2026
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