AD 68-08-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Maryland Air Industries, Inc. | F-27 | Airworthiness Directives; Fairchild-Hiller Model F-27 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27A | Airworthiness Directives; Fairchild-Hiller Model F-27 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27B | Airworthiness Directives; Fairchild-Hiller Model F-27 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27F | Airworthiness Directives; Fairchild-Hiller Model F-27 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27G | Airworthiness Directives; Fairchild-Hiller Model F-27 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27J | Airworthiness Directives; Fairchild-Hiller Model F-27 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27M | Airworthiness Directives; Fairchild-Hiller Model F-27 Aircraft |
Unsafe Condition
Residual fuel fire in the heater outer air passage due to lack of adequate drainage.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Incorporate a heater outer pass drain installation per Fairchild Service Bulletin No. 21-68 Revision No. 1 or later FAA-approved revision, or an equivalent modification approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region. Log heater operational hours until compliance is achieved.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 400 operational heater hours after the effective date of this AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Fairchild-Hiller Model F-27 aircraft, serial numbers 1 to 95 inclusive, incorporating a combustion heater system.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Combustion Heater System
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_68-08-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 68-08-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Fairchild-Hiller Model F-27 Aircraft Subject: Combustion Heater System Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 05/19/1968 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: 68-08-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-583 AD NUMBER: 68-08-03 SUBJECT HEADING: Airworthiness Directives; Fairchild-Hiller Model F-27 Aircraft ACTION: SUMMARY: DATES: Effective May 19, 1968. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 68-08-03 FAIRCHILD-HILLER: Amdt. 39-583. Applies to all F-27 type aircraft Serial Nos. 1 to 95 inclusive incorporating a combustion heater system. Compliance required as indicated unless already accomplished, or unless installed heaters are rendered electrically inoperative and heater controls are placarded to prohibit operation prior to compliance with this AD. To preclude the possibility of residual fuel fire in the heater outer air passage due to lack of adequate drainage, accomplish the following: (a) Within the next 400 operational heater hours after the effective date of this AD, incorporate a heater outer pass drain installation in accordance with Fairchild Service Bulletin No. 21-68 Revision No. 1 dated November 10, 1964, or later FAA-approved revision, or an equivalent modification approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region. (b) Upon the effective date of this AD heater operational hours will be logged until such time as the AD has been complied with. This amendment effective May 19, 1968. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_68-08-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 68-08-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Fairchild-Hiller Model F-27 Aircraft Subject: Combustion Heater System Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 05/19/1968 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: 68-08-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-583 AD NUMBER: 68-08-03 SUBJECT HEADING: Airworthiness Directives; Fairchild-Hiller Model F-27 Aircraft ACTION: SUMMARY: DATES: Effective May 19, 1968. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 68-08-03 FAIRCHILD-HILLER: Amdt. 39-583. Applies to all F-27 type aircraft Serial Nos. 1 to 95 inclusive incorporating a combustion heater system. Compliance required as indicated unless already accomplished, or unless installed heaters are rendered electrically inoperative and heater controls are placarded to prohibit operation prior to compliance with this AD. To preclude the possibility of residual fuel fire in the heater outer air passage due to lack of adequate drainage, accomplish the following: (a) Within the next 400 operational heater hours after the effective date of this AD, incorporate a heater outer pass drain installation in accordance with Fairchild Service Bulletin No. 21-68 Revision No. 1 dated November 10, 1964, or later FAA-approved revision, or an equivalent modification approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region. (b) Upon the effective date of this AD heater operational hours will be logged until such time as the AD has been complied with. This amendment effective May 19, 1968. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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