AD 93-20-01
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron Aviation Inc. | 400A | BEECH AIRCRAFT CORPORATION Model 400A and 400T Airplanes |
| aircraft | Textron Aviation Inc. | 400T | BEECH AIRCRAFT CORPORATION Model 400A and 400T Airplanes |
Unsafe Condition
Improper installation of the engine electronic fuel control (EFC) start circuit wiring, improper positioning of the end terminals on wire P147D6, and absence of a non-conductive sheet on the sidewall upholstery could lead to smoke and/or fire in the cockpit.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 25 hours time-in-service after the effective date, inspect EFC start circuit wiring per SB 2520; install non-conductive sheet part 132-530027-13 per SB 2520; inspect wire P147D6 terminals per Communique 400-101. If wiring is improper, modify prior to flight; if terminals are mispositioned, reposition prior to flight; replace missing moisture shields at next maintenance.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 25 hours time-in-service after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Beech Aircraft Corporation Model 400A (serials RK-45, RK-49 through RK-77, RK-79) and Model 400T (serials TT-01 through TT-42, TT-44)
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Engine Electronic Fuel Control Wiring
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_93-20-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 93-20-01 Document Type: AD Final Rules Docket Number: 93-NM-153-AD Subject Heading: BEECH AIRCRAFT CORPORATION Model 400A and 400T Airplanes Subject: Engine Electronic Fuel Control Wiring Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 11/02/1993 Make: Textron Aviation Inc. Model: 400A | 400T Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 93-20-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 93-NM-153-AD AMENDMENT: 39-8708 AD NUMBER: 93-20-01 SUBJECT HEADING: BEECH AIRCRAFT CORPORATION Model 400A and 400T Airplanes ACTION: SUMMARY: DATES: Effective November 2, 1993. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 93-20-01 BEECH AIRCRAFT CORPORATION: Amendment 39-8708. Docket 93-NM-153-AD. Applicability: Model 400A airplanes having serial numbers RK-45, RK-49 through RK-77 inclusive, and RK-79; and Model 400T (military T-1A) airplanes having serial numbers TT-01 through TT-42 inclusive, and TT-44; certificated in any category. Compliance: Required as indicated, unless accomplished previously. To prevent smoke and/or fire in the cockpit, accomplish the following: (a) Within 25 hours time-in-service after the effective date of this AD, accomplish paragraphs (a)(1), (a)(2), and (a)(3) of this AD. (1) Perform a general visual inspection to verify that the wiring of the engine electronic fuel control (EFC) start circuit has been installed properly, in accordance with Beechcraft Mandatory Service Bulletin 2520, dated August 1993. If the wiring has been installed improperly, prior to further flight, modify the wiring in the engine EFC start circuit in accordance with the service bulletin. (2) Install a non-conductive sheet, part number 132-530027-13, on the sidewall upholstery in accordance with Beechcraft Mandatory Service Bulletin 2520, dated August 1993. (3) Perform a general visual inspection to verify the proper positioning of the end terminals on wire P147D6, in accordance with Beechcraft Safety Communique 400-101, dated July 1993. If the end terminals have been positioned improperly, prior to further flight, reposition the end terminals on wire P147D6 in accordance with the communique. NOTE: While accessing the main circuit panel to comply with the inspections required by this paragraph, as a convenience, operators should verify that moisture (insulator) shields, part numbers 45A88859-11 and 45A88859-31, are installed, in accordance with BEECHCRAFT Beechjet 400/400A Maintenance Manual, Chapter 24-50-00. If any shield is missing, the FAA recommends that it be replaced with an appropriate shield at the next scheduled maintenance service. (b) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Wichita Aircraft Certification Office (ACO), FAA, Small Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Wichita ACO. NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Wichita ACO. (c) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished. (d) The inspection and modification of wiring, and the installation of the non-conductive sheet, shall be done in accordance with Beechcraft Mandatory Service Bulletin 2520, dated August 1993. The inspection and repositioning of the end terminals on wire P147D6 shall be done in accordance with Beechcraft Safety Communique 400-101, dated July 1993. (The issue dates of these service documents are indicated only on page 1 of each document; no other pages of the documents are dated.) This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from Beech Aircraft Corporation, Commercial Services Department, P.O. Box 85, Wichita, Kansas 67201-0085. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at FAA, Small Airplane Directorate, Wichita Aircraft Certification Office, 1801 Airport Road, Room 100, Mid-Continent Airport, Wichita, Kansas 67209; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (e) This amendment becomes effective on November 2, 1993. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_93-20-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 93-20-01 Document Type: AD Final Rules Docket Number: 93-NM-153-AD Subject Heading: BEECH AIRCRAFT CORPORATION Model 400A and 400T Airplanes Subject: Engine Electronic Fuel Control Wiring Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 11/02/1993 Make: Textron Aviation Inc. Model: 400A | 400T 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: 93-20-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 93-NM-153-AD AMENDMENT: 39-8708 AD NUMBER: 93-20-01 SUBJECT HEADING: BEECH AIRCRAFT CORPORATION Model 400A and 400T Airplanes ACTION: SUMMARY: DATES: Effective November 2, 1993. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 93-20-01 BEECH AIRCRAFT CORPORATION: Amendment 39-8708. Docket 93-NM-153-AD. Applicability: Model 400A airplanes having serial numbers RK-45, RK-49 through RK-77 inclusive, and RK-79; and Model 400T (military T-1A) airplanes having serial numbers TT-01 through TT-42 inclusive, and TT-44; certificated in any category. Compliance: Required as indicated, unless accomplished previously. To prevent smoke and/or fire in the cockpit, accomplish the following: (a) Within 25 hours time-in-service after the effective date of this AD, accomplish paragraphs (a)(1), (a)(2), and (a)(3) of this AD. (1) Perform a general visual inspection to verify that the wiring of the engine electronic fuel control (EFC) start circuit has been installed properly, in accordance with Beechcraft Mandatory Service Bulletin 2520, dated August 1993. If the wiring has been installed improperly, prior to further flight, modify the wiring in the engine EFC start circuit in accordance with the service bulletin. (2) Install a non-conductive sheet, part number 132-530027-13, on the sidewall upholstery in accordance with Beechcraft Mandatory Service Bulletin 2520, dated August 1993. (3) Perform a general visual inspection to verify the proper positioning of the end terminals on wire P147D6, in accordance with Beechcraft Safety Communique 400-101, dated July 1993. If the end terminals have been positioned improperly, prior to further flight, reposition the end terminals on wire P147D6 in accordance with the communique. NOTE: While accessing the main circuit panel to comply with the inspections required by this paragraph, as a convenience, operators should verify that moisture (insulator) shields, part numbers 45A88859-11 and 45A88859-31, are installed, in accordance with BEECHCRAFT Beechjet 400/400A Maintenance Manual, Chapter 24-50-00. If any shield is missing, the FAA recommends that it be replaced with an appropriate shield at the next scheduled maintenance service. (b) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Wichita Aircraft Certification Office (ACO), FAA, Small Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Wichita ACO. NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Wichita ACO. (c) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished. (d) The inspection and modification of wiring, and the installation of the non-conductive sheet, shall be done in accordance with Beechcraft Mandatory Service Bulletin 2520, dated August 1993. The inspection and repositioning of the end terminals on wire P147D6 shall be done in accordance with Beechcraft Safety Communique 400-101, dated July 1993. (The issue dates of these service documents are indicated only on page 1 of each document; no other pages of the documents are dated.) This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from Beech Aircraft Corporation, Commercial Services Department, P.O. Box 85, Wichita, Kansas 67201-0085. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at FAA, Small Airplane Directorate, Wichita Aircraft Certification Office, 1801 Airport Road, Room 100, Mid-Continent Airport, Wichita, Kansas 67209; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (e) This amendment becomes effective on November 2, 1993. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.
Related Airworthiness Directives
2023-10-02
final ruleAirworthiness Directives; Transport and Commuter Category Airplanes
Unsafe Condition: Radio altimeter anomalies that are undetected by the automation or pilot, particularly close to the ground (e.g., landing flare), could lead to loss of continued safe flight and landing. Additional...
2014-21-06 Recurring
final ruleAirworthiness Directives; Beechcraft Corporation (Type Certificate Previously Held by Hawker Beechcraft Corporation; Raytheon Aircraft Company; Beech Aircraft Corporation) Airplanes
Unsafe Condition: Failure of the Acme nut threads in a pitch trim actuator (PTA).
2014-15-15 Recurring
final ruleAirworthiness Directives; Beechcraft Corporation Airplanes
Unsafe Condition: Fatigue cracking in the horizontal stabilizer ribs, which could result in the failure of the horizontal stabilizer and loss of pitch control of the airplane.
2013-03-07
final ruleAirworthiness Directives; Hawker Beechcraft Corporation (Type Certificate Previously Held by Raytheon Aircraft Company; Beech Aircraft Corporation) Airplanes
Unsafe Condition: The wiring for the 5-volt direct current (DC) system is undersized and does not have adequate circuit protection for the smaller gauge wire.