AD 93-25-14
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Saab AB, Saab Aerosystems | SAAB 340B | Airworthiness Directives; SAAB-SCANIA Model SAAB SF340A and 340B Series Airplanes |
| aircraft | Saab AB, Saab Aerosystems | 340A (SAAB SF340A) | Airworthiness Directives; SAAB-SCANIA Model SAAB SF340A and 340B Series Airplanes |
Unsafe Condition
Loss of AC electrical power and local area damage that may lead to further electrical failures and smoke in the cockpit due to AC generator control relays, part number SM15CXD1.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace left- and right-hand AC generator control relays (P/N SM15CXD1) with new relays (P/N SM15CXD4) at positions 7XA and 8XA within 6 months after the effective date. Do not install P/N SM15CXD1 relays at positions 7XA or 8XA after the effective date. Compliance adjustments may be requested through the FAA.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 6 months after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Model SAAB SF340A series airplanes, serial numbers 004 through 159 inclusive; and Model SAAB 340B series airplanes, serial numbers 160 through 325 inclusive
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
AC Generator Control Relays
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_93-25-14.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 93-25-14 Document Type: AD Final Rules Docket Number: 93-NM-137-AD Subject Heading: Airworthiness Directives; SAAB-SCANIA Model SAAB SF340A and 340B Series Airplanes Subject: AC Generator Control Relays Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 02/14/1994 Make: Saab AB, Saab Aerosystems Model: SAAB 340B | 340A (SAAB SF340A) Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 93-25-14 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 93-NM-137-AD AMENDMENT: 39-8778 AD NUMBER: 93-25-14 SUBJECT HEADING: Airworthiness Directives; SAAB-SCANIA Model SAAB SF340A and 340B Series Airplanes ACTION: Final rule SUMMARY: DATES: Effective February 14, 1994. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 93-25-14 SAAB-SCANIA: Amendment 39-8778. Docket 93-NM-137-AD. Applicability: Model SAAB SF340A series airplanes, serial numbers 004 through 159 inclusive; and Model SAAB 340B series airplanes, serial numbers 160 through 325 inclusive; certificated in any category. Compliance: Required as indicated, unless accomplished previously. To prevent loss of AC electrical power, and local area damage that may lead to further electrical failures and smoke in the cockpit, accomplish the following: (a) Within 6 months after the effective date of this AD, replace the left- and right-hand AC generator control relays, part number (P/N) SM15CXD1, with new relays, P/N SM15CXD4, at generator control positions 7XA and 8XA, in accordance with SAAB 340 Service Bulletin SAAB 340-24-022, dated October 21, 1992. (b) As of the effective date of this AD, no person shall install an AC generator control relay, P/N SM15CXD1, at generator control positions 7XA or 8XA on any airplane. (c) 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, Standardization Branch, ANM-113, FAA, Transport 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, Standardization Branch, ANM-113. NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Standardization Branch, ANM-113. (d) 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. (e) The replacement shall be done in accordance with SAAB 340 Service Bulletin SAAB 340- 24-022, dated October 21, 1992. 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 SAAB-SCANIA AB, SAAB Aircraft Support Product, S-581.88, Linkoping, Sweden. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (f) This amendment becomes effective on February 14, 1994. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_93-25-14.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 93-25-14 Document Type: AD Final Rules Docket Number: 93-NM-137-AD Subject Heading: Airworthiness Directives; SAAB-SCANIA Model SAAB SF340A and 340B Series Airplanes Subject: AC Generator Control Relays Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 02/14/1994 Make: Saab AB, Saab Aerosystems Model: SAAB 340B | 340A (SAAB SF340A) 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: 93-25-14 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 93-NM-137-AD AMENDMENT: 39-8778 AD NUMBER: 93-25-14 SUBJECT HEADING: Airworthiness Directives; SAAB-SCANIA Model SAAB SF340A and 340B Series Airplanes ACTION: Final rule SUMMARY: DATES: Effective February 14, 1994. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 93-25-14 SAAB-SCANIA: Amendment 39-8778. Docket 93-NM-137-AD. Applicability: Model SAAB SF340A series airplanes, serial numbers 004 through 159 inclusive; and Model SAAB 340B series airplanes, serial numbers 160 through 325 inclusive; certificated in any category. Compliance: Required as indicated, unless accomplished previously. To prevent loss of AC electrical power, and local area damage that may lead to further electrical failures and smoke in the cockpit, accomplish the following: (a) Within 6 months after the effective date of this AD, replace the left- and right-hand AC generator control relays, part number (P/N) SM15CXD1, with new relays, P/N SM15CXD4, at generator control positions 7XA and 8XA, in accordance with SAAB 340 Service Bulletin SAAB 340-24-022, dated October 21, 1992. (b) As of the effective date of this AD, no person shall install an AC generator control relay, P/N SM15CXD1, at generator control positions 7XA or 8XA on any airplane. (c) 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, Standardization Branch, ANM-113, FAA, Transport 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, Standardization Branch, ANM-113. NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Standardization Branch, ANM-113. (d) 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. (e) The replacement shall be done in accordance with SAAB 340 Service Bulletin SAAB 340- 24-022, dated October 21, 1992. 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 SAAB-SCANIA AB, SAAB Aircraft Support Product, S-581.88, Linkoping, Sweden. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (f) This amendment becomes effective on February 14, 1994. 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
2014-26-03
final ruleAirworthiness Directives; Saab AB, Saab Aerosystems Airplanes
Unsafe Condition: Incorrect elevator position quoted in the aircraft maintenance manual and incorrect installation of the trunnion at the lower part of the control column.
2014-01-03 Recurring
final ruleAirworthiness Directives; Saab AB, Saab Aerosystems Airplanes
Unsafe Condition: Brushes wearing beyond their limits in the air conditioning motor, causing smoke, a burning odor, and possible fire in the flight deck and cabin.
2012-13-01
final ruleAirworthiness Directives; Saab AB, Saab Aerosystems Airplanes
Unsafe Condition: Wear of the elevator pushrods has occurred on some airplanes after extended time in service, leading to degradation of the pushrod which causes backlash between the rod end threads.
2011-27-05
final ruleAirworthiness Directives; Saab AB, Saab Aerosystems Airplanes
Unsafe Condition: Reports of broken wires and corroded connectors in the SAAB 340 main landing gear (MLG) emergency release system, which could inhibit the functioning of the separation bolt and prevent proper relea...
