AD 90-10-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Saab AB, Saab Aerosystems | SAAB 340B | Airworthiness Directives; SAAB-SCANIA Model SAAB 340B Series Airplanes |
Unsafe Condition
Oscillations (flutter) of the rudder
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install a cockpit placard restricting airspeed to 220 KIAS within 10 flight hours time-in-service. Incorporate the speed restriction into the AFM's Limitations Section. Install new rudder and rudder trim tab balance weights within 90 days after the AD's effective date. Remove the placard and AFM limitation after balance weights are installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 10 flight hours time-in-service and within 90 days after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
SAAB-SCANIA Model SAAB 340B series airplanes, Serial Numbers 161 through 197
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
AFM Changes - Rudder
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_90-10-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 90-10-06 Document Type: AD Final Rules Docket Number: 90-NM-64-AD Subject Heading: Airworthiness Directives; SAAB-SCANIA Model SAAB 340B Series Airplanes Subject: AFM Changes - Rudder Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 05/24/1990 Make: Saab AB, Saab Aerosystems Model: SAAB 340B Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 90-10-06 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 90-NM-64-AD AMENDMENT: 39-6595 AD NUMBER: 90-10-06 SUBJECT HEADING: Airworthiness Directives; SAAB-SCANIA Model SAAB 340B Series Airplanes ACTION: Final rule SUMMARY: DATES: Effective May 24, 1990. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 90-10-06 SAAB-SCANIA: Amendment 39-6595. Docket No. 90-NM-64-AD. Applicability: Model SAAB 340B series airplanes, Serial Numbers 161 through 197, certificated in any category. Compliance: Required as indicated, unless previously accomplished. To prevent oscillations (flutter) of the rudder, accomplish the following: A. Within 10 flight hours time-in-service, accomplish the following: 1. Install a placard in the cockpit stating: "Air Speed Restricted to 220 KIAS", and 2. Incorporate the following into the Limitations Section of the FAA-approved Airplane Flight Manual (AFM): Restrict the maximum operating speed to 220 KIAS in accordance with Section 2. under "Short Term Actions" of SAAB 340 Service Newsletter, SN-9002, Revision 1, dated February 19, 1990. This may be accomplished by inserting a copy of this AD in the AFM. B. Within 90 days after the effective date of this AD, install new rudder and rudder trim tab balance weights in accordance with SAAB-Scania Service Bulletin SAAB 340-55-026, dated March 16, 1990. Upon installation of these balance weights, the placard and flight manual limitation required by paragraph A., above, may be removed. C. An alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Standardization Branch, ANM- 113, FAA, Northwest Mountain Region. NOTE: The request should be forwarded through an FAA Principal Maintenance Inspector (PMI), who will either concur or comment and then send it to the Manager, Standardization Branch, ANM-113. D. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD. All persons affected by this directive who have not already received the appropriate service information from the manufacturer may obtain copies upon request to SAAB-Scania AB, SAAB Aircraft Product Support, S-581.88, Linkoping, Sweden. This information may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, or at the Standardization Branch, 9010 East Marginal Way South, Seattle, Washington. This amendment (39-6595, AD 90-10-06) becomes effective on May 24, 1990. FOOTER:
Document Text
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AD Final Rules - DRS_90-10-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 90-10-06 Document Type: AD Final Rules Docket Number: 90-NM-64-AD Subject Heading: Airworthiness Directives; SAAB-SCANIA Model SAAB 340B Series Airplanes Subject: AFM Changes - Rudder Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 05/24/1990 Make: Saab AB, Saab Aerosystems Model: SAAB 340B 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: 90-10-06 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 90-NM-64-AD AMENDMENT: 39-6595 AD NUMBER: 90-10-06 SUBJECT HEADING: Airworthiness Directives; SAAB-SCANIA Model SAAB 340B Series Airplanes ACTION: Final rule SUMMARY: DATES: Effective May 24, 1990. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 90-10-06 SAAB-SCANIA: Amendment 39-6595. Docket No. 90-NM-64-AD. Applicability: Model SAAB 340B series airplanes, Serial Numbers 161 through 197, certificated in any category. Compliance: Required as indicated, unless previously accomplished. To prevent oscillations (flutter) of the rudder, accomplish the following: A. Within 10 flight hours time-in-service, accomplish the following: 1. Install a placard in the cockpit stating: "Air Speed Restricted to 220 KIAS", and 2. Incorporate the following into the Limitations Section of the FAA-approved Airplane Flight Manual (AFM): Restrict the maximum operating speed to 220 KIAS in accordance with Section 2. under "Short Term Actions" of SAAB 340 Service Newsletter, SN-9002, Revision 1, dated February 19, 1990. This may be accomplished by inserting a copy of this AD in the AFM. B. Within 90 days after the effective date of this AD, install new rudder and rudder trim tab balance weights in accordance with SAAB-Scania Service Bulletin SAAB 340-55-026, dated March 16, 1990. Upon installation of these balance weights, the placard and flight manual limitation required by paragraph A., above, may be removed. C. An alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Standardization Branch, ANM- 113, FAA, Northwest Mountain Region. NOTE: The request should be forwarded through an FAA Principal Maintenance Inspector (PMI), who will either concur or comment and then send it to the Manager, Standardization Branch, ANM-113. D. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD. All persons affected by this directive who have not already received the appropriate service information from the manufacturer may obtain copies upon request to SAAB-Scania AB, SAAB Aircraft Product Support, S-581.88, Linkoping, Sweden. This information may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, or at the Standardization Branch, 9010 East Marginal Way South, Seattle, Washington. This amendment (39-6595, AD 90-10-06) becomes effective on May 24, 1990. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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