AD 90-14-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 737-300 Series | Airworthiness Directives; BOEING Model 737-300 and 737-400 Series Airplanes |
| aircraft | The Boeing Company | 737-400 Series | Airworthiness Directives; BOEING Model 737-300 and 737-400 Series Airplanes |
Unsafe Condition
Inadvertent rudder trim resulting in unacceptably increasing the level of pilot effort required to maintain the correct heading during takeoff, which may result in a rejected takeoff.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the rudder trim control knob with a smooth rounded fluted knob approved by the FAA. Add or modify a guard rail to the rear of the cockpit center console to a height of approximately 1.5 inches if the knob is located there. Allow alternate compliance with FAA approval.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 12 months after the effective date of this AD, unless previously accomplished
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
All Model 737-300 and 737-400 series airplanes, certificated in any category.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Rudder Trim Control Knob
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_90-14-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 90-14-02 Document Type: AD Final Rules Docket Number: 90-NM-13-AD Subject Heading: Airworthiness Directives; BOEING Model 737-300 and 737-400 Series Airplanes Subject: Rudder Trim Control Knob Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 08/06/1990 Make: The Boeing Company Model: 737-300 Series | 737-400 Series Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 90-14-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 90-NM-13-AD AMENDMENT: 39-6644 AD NUMBER: 90-14-02 SUBJECT HEADING: Airworthiness Directives; BOEING Model 737-300 and 737-400 Series Airplanes ACTION: SUMMARY: DATES: Effective August 6, 1990. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 90-14-02 BOEING: Amendment 39-6644. Docket No. 90-NM-13-AD. Applicability: All Model 737-300 and 737-400 series airplanes, certificated in any category. Compliance: Required within the next 12 months after the effective date of this AD, unless previously accomplished. To prevent inadvertent rudder trim resulting in unacceptably increasing the level of pilot effort required to maintain the correct heading during takeoff, which may result in a rejected takeoff, accomplish the following: A. Replace the rudder trim control knob with a smooth rounded fluted knob approved by the Manager, Seattle Aircraft Certification Office, FAA, Transport Airplane Directorate. B. If the rudder trim control knob is located near the rear of the cockpit center console, add a guard rail with a height of approximately 1.5 inches to the rear of the cockpit center console if no rail is currently installed, or, if a rail is currently installed, raise the cockpit center console rear rail to a height of approximately 1.5 inches, in accordance with procedures approved by the Manager, Seattle Aircraft Certification Office, FAA, Transport Airplane Directorate. 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, Seattle Aircraft Certification Office (ACO), FAA, Northwest Mountain Region. NOTE: The request should be submitted directly to the Manager, Seattle ACO, and a copy sent to the cognizant FAA Principal Maintenance Inspector (PMI). The PMI will then forward comments or concurrence to the Seattle ACO. 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. This amendment (39-6644, AD 90-14-02) becomes effective on August 6, 1990. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_90-14-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 90-14-02 Document Type: AD Final Rules Docket Number: 90-NM-13-AD Subject Heading: Airworthiness Directives; BOEING Model 737-300 and 737-400 Series Airplanes Subject: Rudder Trim Control Knob Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 08/06/1990 Make: The Boeing Company Model: 737-300 Series | 737-400 Series 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: 90-14-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 90-NM-13-AD AMENDMENT: 39-6644 AD NUMBER: 90-14-02 SUBJECT HEADING: Airworthiness Directives; BOEING Model 737-300 and 737-400 Series Airplanes ACTION: SUMMARY: DATES: Effective August 6, 1990. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 90-14-02 BOEING: Amendment 39-6644. Docket No. 90-NM-13-AD. Applicability: All Model 737-300 and 737-400 series airplanes, certificated in any category. Compliance: Required within the next 12 months after the effective date of this AD, unless previously accomplished. To prevent inadvertent rudder trim resulting in unacceptably increasing the level of pilot effort required to maintain the correct heading during takeoff, which may result in a rejected takeoff, accomplish the following: A. Replace the rudder trim control knob with a smooth rounded fluted knob approved by the Manager, Seattle Aircraft Certification Office, FAA, Transport Airplane Directorate. B. If the rudder trim control knob is located near the rear of the cockpit center console, add a guard rail with a height of approximately 1.5 inches to the rear of the cockpit center console if no rail is currently installed, or, if a rail is currently installed, raise the cockpit center console rear rail to a height of approximately 1.5 inches, in accordance with procedures approved by the Manager, Seattle Aircraft Certification Office, FAA, Transport Airplane Directorate. 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, Seattle Aircraft Certification Office (ACO), FAA, Northwest Mountain Region. NOTE: The request should be submitted directly to the Manager, Seattle ACO, and a copy sent to the cognizant FAA Principal Maintenance Inspector (PMI). The PMI will then forward comments or concurrence to the Seattle ACO. 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. This amendment (39-6644, AD 90-14-02) becomes effective on August 6, 1990. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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