AD 77-10-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Piper Aircraft Inc. | PA-31-325 | Airworthiness Directives; Piper Model PA-31-325 Airplanes |
Unsafe Condition
Possible adverse airplane vibration effects at higher altitudes
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Attach the operating limitation placard on the pilot's instrument panel between the clock and airspeed indicator stating 'Above 21,000 feet reduce Vno speed 3 m.p.h. per 1000 feet'
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 25 hours in service after the effective date of this Airworthiness Directive
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Piper Model PA-31-325 Airplanes
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Vibration Effects
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_77-10-09.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 77-10-09 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Piper Model PA-31-325 Airplanes Subject: Vibration Effects Status: Current Citation: This information is not available. Citation Publish Date: 05/16/1977 Effective Date: 05/17/1977 Make: Piper Aircraft Inc. Model: PA-31-325 Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: AIR-700: Compliance & Airworthiness Division Office of Primary Responsibility: AIR-720: Operational Safety Branch CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 77-10-09 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2899 AD NUMBER: 77-10-09 SUBJECT HEADING: Airworthiness Directives; Piper Model PA-31-325 Airplanes ACTION: SUMMARY: DATES: Effective May 17, 1977. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 77-10-09 PIPER: Amendment 39-2899. Applies to PA-31-325. To prevent possible adverse airplane vibration effects at higher altitudes, accomplish the following within the next 25 hours in service after the effective date of this Airworthiness Directive unless already accomplished: Attach the following operating limitation placard on the pilot's instrument panel between the clock and airspeed indicator in full view of the pilot: "Above 21,000 feet reduce Vno speed 3 m.p.h. per 1000 feet" (Piper Service Bulletin No. 544 refers to this subject.) This amendment becomes effective May 17, 1977. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_77-10-09.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 77-10-09 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Piper Model PA-31-325 Airplanes Subject: Vibration Effects Status: Current Citation: This information is not available. Citation Publish Date: 05/16/1977 Effective Date: 05/17/1977 Make: Piper Aircraft Inc. Model: PA-31-325 Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: AIR-700: Compliance & Airworthiness Division Office of Primary Responsibility: AIR-720: Operational Safety Branch CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 77-10-09 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2899 AD NUMBER: 77-10-09 SUBJECT HEADING: Airworthiness Directives; Piper Model PA-31-325 Airplanes ACTION: SUMMARY: DATES: Effective May 17, 1977. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 77-10-09 PIPER: Amendment 39-2899. Applies to PA-31-325. To prevent possible adverse airplane vibration effects at higher altitudes, accomplish the following within the next 25 hours in service after the effective date of this Airworthiness Directive unless already accomplished: Attach the following operating limitation placard on the pilot's instrument panel between the clock and airspeed indicator in full view of the pilot: "Above 21,000 feet reduce Vno speed 3 m.p.h. per 1000 feet" (Piper Service Bulletin No. 544 refers to this subject.) This amendment becomes effective May 17, 1977. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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