AD 64-21-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Maryland Air Industries, Inc. | F-27 | Airworthiness Directives; FAIRCHILD Model F-27 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27A | Airworthiness Directives; FAIRCHILD Model F-27 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27B | Airworthiness Directives; FAIRCHILD Model F-27 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27F | Airworthiness Directives; FAIRCHILD Model F-27 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27G | Airworthiness Directives; FAIRCHILD Model F-27 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27J | Airworthiness Directives; FAIRCHILD Model F-27 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27M | Airworthiness Directives; FAIRCHILD Model F-27 Aircraft |
Unsafe Condition
Cracks have been found in the rib caps and stringers in the vertical stabilizer where the rib at water line 201.575 attaches to the hat and zee section stringers.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect for cracks in the skin, rib, and stringers on both sides of the vertical stabilizer along and directly adjacent to water line 201.575 using X-ray, dye penetrant with at least a 10-power glass, or FAA-approved equivalent. Repair or replace cracked parts with FAA-approved repair or same part number before further flight, except ferry flight under CAR 1.76. Adjust inspection intervals per Fairchild Service Bulletin 55-4 or FAA approval.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Compliance required as indicated. For aircraft with less than 1,000 hours' time in service on the effective date, comply prior to 1,050 hours' time in service (if not within last 200 hours) and thereafter every 200 hours. For aircraft with 1,000+ hours, comply within 50 hours after effective date (if not within last 150 hours) and thereafter every 200 hours.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Maryland Air Industries, Inc. Model F-27 Aircraft, Serial Numbers 1 through 97, and 99.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Vertical Stabilizer
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_64-21-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 64-21-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; FAIRCHILD Model F-27 Aircraft Subject: Vertical Stabilizer Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 09/12/1964 Make: Maryland Air Industries, Inc. Model: F-27 | F-27A | F-27B | F-27F | F-27G | F-27J | F-27M 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: 64-21-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 64-21-04 SUBJECT HEADING: Airworthiness Directives; FAIRCHILD Model F-27 Aircraft ACTION: SUMMARY: DATES: Effective September 12, 1964. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 64-21-04 FAIRCHILD: Amdt. 814 Part 507 Federal Register September 11, 1964. Applies to Model F-27 Aircraft, Serial Numbers 1 through 97, and 99. Compliance required as indicated. There have been cracks found in the rib caps and stringers in the vertical stabilizer where the rib at water line 201.575 attaches to the hat and zee section stringers. To preclude the condition from developing in other such aircraft, accomplish the following: (a) On aircraft with less than 1,000 hours' time in service on the effective date of this AD, comply with (c) prior to the accumulation 1,050 hours' time in service, unless already accomplished within the last 200 hours' time in service, and thereafter at intervals not to exceed 200 hours' time in service from the last inspection. (b) On aircraft with 1,000 or more hours' time in service on the effective date of this AD, comply with (c) within the next 50 hours' time in service after the effective date of this AD, unless already accomplished within the last 150 hours' time in service, and at intervals thereafter not to exceed 200 hours' time in service from the last inspection. (c) Inspect for cracks in the skin, rib and stringers on both sides of the vertical stabilizer along and directly adjacent to water line 201.575, from the trailing edge of the stabilizer, forward, to the auxiliary spar (located directly aft of the stabilizer leading edges). Use X-ray or dye penetrant in conjunction with at least a 10-power glass, or FAA-approved equivalent inspection. If cracks are found accomplish (d). (d) Repair cracked parts in accordance with an FAA-approved repair or replace cracked parts with a part of the same part number or an FAA approved equivalent before further flight except that a ferry flight may be made in accordance with the provisions of CAR 1.76. (e) The repetitive inspection intervals specified in (a) and (b) may be increased from 200 hours' time in service to 800 hours' time in service from the last inspection on aircraft that are modified in accordance with Fairchild Service Bulletin No. 55-4 dated March 1, 1963, or an FAA approved equivalent. (f) Upon request of the operator, an FAA maintenance inspector, subject to prior approval of the Chief, Engineering and Manufacturing Branch, FAA Eastern Region, may adjust the repetitive inspection intervals specified in this AD to permit compliance at an established inspection period of the operator if the request contains substantiating data to justify the increase for such operator. (Fairchild Service Bulletins 55-4 dated March 1, 1963, and 55-5 dated March 1, 1963, cover this subject.) This supersedes AD 63-10-2. This directive effective September 12, 1964. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_64-21-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 64-21-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; FAIRCHILD Model F-27 Aircraft Subject: Vertical Stabilizer Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 09/12/1964 Make: Maryland Air Industries, Inc. Model: F-27 | F-27A | F-27B | F-27F | F-27G | F-27J | F-27M 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: 64-21-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 64-21-04 SUBJECT HEADING: Airworthiness Directives; FAIRCHILD Model F-27 Aircraft ACTION: SUMMARY: DATES: Effective September 12, 1964. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 64-21-04 FAIRCHILD: Amdt. 814 Part 507 Federal Register September 11, 1964. Applies to Model F-27 Aircraft, Serial Numbers 1 through 97, and 99. Compliance required as indicated. There have been cracks found in the rib caps and stringers in the vertical stabilizer where the rib at water line 201.575 attaches to the hat and zee section stringers. To preclude the condition from developing in other such aircraft, accomplish the following: (a) On aircraft with less than 1,000 hours' time in service on the effective date of this AD, comply with (c) prior to the accumulation 1,050 hours' time in service, unless already accomplished within the last 200 hours' time in service, and thereafter at intervals not to exceed 200 hours' time in service from the last inspection. (b) On aircraft with 1,000 or more hours' time in service on the effective date of this AD, comply with (c) within the next 50 hours' time in service after the effective date of this AD, unless already accomplished within the last 150 hours' time in service, and at intervals thereafter not to exceed 200 hours' time in service from the last inspection. (c) Inspect for cracks in the skin, rib and stringers on both sides of the vertical stabilizer along and directly adjacent to water line 201.575, from the trailing edge of the stabilizer, forward, to the auxiliary spar (located directly aft of the stabilizer leading edges). Use X-ray or dye penetrant in conjunction with at least a 10-power glass, or FAA-approved equivalent inspection. If cracks are found accomplish (d). (d) Repair cracked parts in accordance with an FAA-approved repair or replace cracked parts with a part of the same part number or an FAA approved equivalent before further flight except that a ferry flight may be made in accordance with the provisions of CAR 1.76. (e) The repetitive inspection intervals specified in (a) and (b) may be increased from 200 hours' time in service to 800 hours' time in service from the last inspection on aircraft that are modified in accordance with Fairchild Service Bulletin No. 55-4 dated March 1, 1963, or an FAA approved equivalent. (f) Upon request of the operator, an FAA maintenance inspector, subject to prior approval of the Chief, Engineering and Manufacturing Branch, FAA Eastern Region, may adjust the repetitive inspection intervals specified in this AD to permit compliance at an established inspection period of the operator if the request contains substantiating data to justify the increase for such operator. (Fairchild Service Bulletins 55-4 dated March 1, 1963, and 55-5 dated March 1, 1963, cover this subject.) This supersedes AD 63-10-2. This directive effective September 12, 1964. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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