AD 74-18-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron Aviation Inc. | A100 | Airworthiness Directives; BEECH Model A100 Airplanes |
| aircraft | Textron Aviation Inc. | A100-1 (U-21J) | Airworthiness Directives; BEECH Model A100 Airplanes |
| aircraft | Textron Aviation Inc. | A100A | Airworthiness Directives; BEECH Model A100 Airplanes |
| aircraft | Textron Aviation Inc. | A100C | Airworthiness Directives; BEECH Model A100 Airplanes |
Unsafe Condition
Fuel transfer sump drain line tube assemblies may contact the reverse current diode heat sink, causing potential fuel leakage and electrical system damage.
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Required Actions
Visually inspect for minimum one-half inch separation between fuel transfer sump drain line tube assemblies and reverse current diode heat sink. Hand form and temporarily support with clamps/brackets as needed. Replace existing tube assemblies with new ones (P/N 100-920001-205 LH and P/N 100-920001-206 RH) within 200 hours' time-in-service after AD effective date.
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Compliance Time
Prior to further flight and within 200 hours' time-in-service after the effective date of this AD
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Affected Aircraft
BEECH Model A100 airplanes with serial numbers B-90 through B-92, B-94 through B-102, B-104, B-105, B-107 through B-109, B-111, B-115, B-116, B-118, B-119, and B-121 through B-204, except those equipped with the optional 300 ampere generator system.
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Federal Register Abstract
Fuel Sump Drain Line
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_74-18-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 74-18-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; BEECH Model A100 Airplanes Subject: Fuel Sump Drain Line Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 08/30/1974 Make: Textron Aviation Inc. Model: A100 | A100-1 (U-21J) | A100A | A100C Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 74-18-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1938 AD NUMBER: 74-18-04 SUBJECT HEADING: Airworthiness Directives; BEECH Model A100 Airplanes ACTION: SUMMARY: DATES: Effective August 30, 1974. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 74-18-04 BEECH: Amendment 39-1938. Applies to Model A100 (Serial Numbers B-90 through B-92, B-94 through B-102, B-104, B-105, B-107 through B-109, B-111, B-115, B-116, B-118, B-119 and B-121 through B-204) airplanes (except any aircraft serials listed which are equipped with the optional 300 ampere generator system). Compliance: Required as indicated, unless already accomplished. To prevent the fuel transfer sump drain line tube assemblies from contacting the reverse current diode heat sink, accomplish the following: A) Prior to further flight, visually inspect the fuel transfer sump drain line tube assemblies (P/N 100-920001-113 LH and P/N 100-920001-114 RH) for a minimum separation of one-half inch between the fuel transfer sump drain line tube assemblies and the reverse current diode heat sink, located in the aft landing gear wheel wells. Hand form and temporarily support the fuel transfer sump drain line tube assemblies with suitable clamps and/or brackets as necessary to maintain this separation. B) Within 200 hours' time-in-service after the effective date of this AD, remove existing fuel transfer sump drain line tube assemblies (P/N 100-920001-113 LH and P/N 100- 920001-114 RH) and install new fuel transfer sump drain line tube assemblies (P/N 100-920001- 205 LH and P/N 100-920001-206 RH) in accordance with Beech Service Instruction 0668-281 or subsequent revisions. C) Any equivalent method of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region. This amendment becomes effective August 30, 1974. FOOTER:
Document Text
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AD Final Rules - DRS_74-18-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 74-18-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; BEECH Model A100 Airplanes Subject: Fuel Sump Drain Line Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 08/30/1974 Make: Textron Aviation Inc. Model: A100 | A100-1 (U-21J) | A100A | A100C Product Type: Aircraft Product Subtype: Small 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: 74-18-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1938 AD NUMBER: 74-18-04 SUBJECT HEADING: Airworthiness Directives; BEECH Model A100 Airplanes ACTION: SUMMARY: DATES: Effective August 30, 1974. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 74-18-04 BEECH: Amendment 39-1938. Applies to Model A100 (Serial Numbers B-90 through B-92, B-94 through B-102, B-104, B-105, B-107 through B-109, B-111, B-115, B-116, B-118, B-119 and B-121 through B-204) airplanes (except any aircraft serials listed which are equipped with the optional 300 ampere generator system). Compliance: Required as indicated, unless already accomplished. To prevent the fuel transfer sump drain line tube assemblies from contacting the reverse current diode heat sink, accomplish the following: A) Prior to further flight, visually inspect the fuel transfer sump drain line tube assemblies (P/N 100-920001-113 LH and P/N 100-920001-114 RH) for a minimum separation of one-half inch between the fuel transfer sump drain line tube assemblies and the reverse current diode heat sink, located in the aft landing gear wheel wells. Hand form and temporarily support the fuel transfer sump drain line tube assemblies with suitable clamps and/or brackets as necessary to maintain this separation. B) Within 200 hours' time-in-service after the effective date of this AD, remove existing fuel transfer sump drain line tube assemblies (P/N 100-920001-113 LH and P/N 100- 920001-114 RH) and install new fuel transfer sump drain line tube assemblies (P/N 100-920001- 205 LH and P/N 100-920001-206 RH) in accordance with Beech Service Instruction 0668-281 or subsequent revisions. C) Any equivalent method of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region. This amendment becomes effective August 30, 1974. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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