AD 59-18-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Maryland Air Industries, Inc. | F-27 | Airworthiness Directives; Fairchild All F-27 Series Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27A | Airworthiness Directives; Fairchild All F-27 Series Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27B | Airworthiness Directives; Fairchild All F-27 Series Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27F | Airworthiness Directives; Fairchild All F-27 Series Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27G | Airworthiness Directives; Fairchild All F-27 Series Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27J | Airworthiness Directives; Fairchild All F-27 Series Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27M | Airworthiness Directives; Fairchild All F-27 Series Airplanes |
Unsafe Condition
Leakage at the heater fuel line fittings could lead to fuel leakage and potential fire hazard.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove and modify shroud assemblies by punching 1/8-inch holes, remove existing drain tube assemblies, install new drain tube assembly P/N 27-774750-11, install modified shroud assemblies with specified clamps, bolts, and nuts, install new hoses with clamps, and install new plates and clamps with screws and nuts. Specific modifications include drilling a 5/8-inch hole on airplanes 1-6 and installing a grommet and skin patch.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
not later than October 15, 1959
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Fairchild F-27 Series aircraft equipped with the heater system, including models F-27, F-27A, F-27B, F-27F, F-27G, F-27J, F-27M
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Combustion Heater Modification
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_59-18-05.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 59-18-05 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Fairchild All F-27 Series Airplanes Subject: Combustion Heater Modification Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 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: 59-18-05 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 59-18-05 SUBJECT HEADING: Airworthiness Directives; Fairchild All F-27 Series Airplanes ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 59-18-05 FAIRCHILD: Applies to all F-27 Series aircraft equipped with the heater system. Compliance required not later than October 15, 1959. (a) In order to provide drainage of possible leakage at the heater fuel line fittings, remove three shroud assemblies, P/N 27-774575-1, attached to tube connections at top of heater fuel control, P/N 43C80, and heater P/N 49C65. Modify shroud assemblies by punching one (1) 1/8-inch diameter hole in side of shroud 1 13/64 inches from top. (b) Remove fuel control drain tube assembly, P/N 27-774554-11 or -51, whichever installed. (c) On airplanes Nos. 1 to 6 inclusive, drill 5/8-inch diameter hole in bottom fuselage skin between stringers Nos. 102 and 103, 2 1/2 inches aft of Station 731, and install AN 931-6-10 grommet removed from former location of drain line. Install flush skin patch over former drain hole location in accordance with Chapter 51-7 of F-27 Structural Repair Manual. (d) On all affected airplanes, install new drain tube assembly, P/N 27-774750-11 in place of 27-774554-11 or -51. (e) Install modified shroud assemblies, using three each new half clamp assemblies, P/N 27-774749-11, half clamp P/N 27-774749-3, bolt P/N AN 3-3A, and nuts P/N MS 20365-1032. (f) Install one each new hose, P/N 27-774094-3 and -5 between heater fuel control shrouds and drain tube and P/N 27-774094-7 between heater shroud and drain tube, using six new clamps, P/N AN 737RM22. (g) Install two new plates, P/N 27-774749-9, on the heater fuel control unit, and four new clamps, P/N AN 742-8, two on the plates at the fuel control unit to support 27-774094-3 and -5 hose and two on the flanges of the fuselage former at Stations 730 and 731 to support 27-774094-7 hose. Use four each new screws P/N AN 525-10R6, and nuts P/N MS 20365-1032. (Fairchild F-27 Service Bulletin No. 21-49 dated June 12, 1959, covers this same subject.) Compliance with AD 59-12-01 no longer required after compliance with this directive. FOOTER:
Document Text
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AD Final Rules - DRS_59-18-05.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 59-18-05 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Fairchild All F-27 Series Airplanes Subject: Combustion Heater Modification Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 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: 59-18-05 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 59-18-05 SUBJECT HEADING: Airworthiness Directives; Fairchild All F-27 Series Airplanes ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 59-18-05 FAIRCHILD: Applies to all F-27 Series aircraft equipped with the heater system. Compliance required not later than October 15, 1959. (a) In order to provide drainage of possible leakage at the heater fuel line fittings, remove three shroud assemblies, P/N 27-774575-1, attached to tube connections at top of heater fuel control, P/N 43C80, and heater P/N 49C65. Modify shroud assemblies by punching one (1) 1/8-inch diameter hole in side of shroud 1 13/64 inches from top. (b) Remove fuel control drain tube assembly, P/N 27-774554-11 or -51, whichever installed. (c) On airplanes Nos. 1 to 6 inclusive, drill 5/8-inch diameter hole in bottom fuselage skin between stringers Nos. 102 and 103, 2 1/2 inches aft of Station 731, and install AN 931-6-10 grommet removed from former location of drain line. Install flush skin patch over former drain hole location in accordance with Chapter 51-7 of F-27 Structural Repair Manual. (d) On all affected airplanes, install new drain tube assembly, P/N 27-774750-11 in place of 27-774554-11 or -51. (e) Install modified shroud assemblies, using three each new half clamp assemblies, P/N 27-774749-11, half clamp P/N 27-774749-3, bolt P/N AN 3-3A, and nuts P/N MS 20365-1032. (f) Install one each new hose, P/N 27-774094-3 and -5 between heater fuel control shrouds and drain tube and P/N 27-774094-7 between heater shroud and drain tube, using six new clamps, P/N AN 737RM22. (g) Install two new plates, P/N 27-774749-9, on the heater fuel control unit, and four new clamps, P/N AN 742-8, two on the plates at the fuel control unit to support 27-774094-3 and -5 hose and two on the flanges of the fuselage former at Stations 730 and 731 to support 27-774094-7 hose. Use four each new screws P/N AN 525-10R6, and nuts P/N MS 20365-1032. (Fairchild F-27 Service Bulletin No. 21-49 dated June 12, 1959, covers this same subject.) Compliance with AD 59-12-01 no longer required after compliance with this directive. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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