AD 47-27-01
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Waco Aircraft Company, The | UKS-7 | Airworthiness Directives; WACO Model UKS-7, VKS-7, and VKS-7F Aircraft |
| aircraft | Waco Aircraft Company, The | VKS-7 (Army UC-72D) | Airworthiness Directives; WACO Model UKS-7, VKS-7, and VKS-7F Aircraft |
| aircraft | Waco Aircraft Company, The | VKS-7F | Airworthiness Directives; WACO Model UKS-7, VKS-7, and VKS-7F Aircraft |
Unsafe Condition
Damage to plywood tank support and wing spars caused by collection of moisture in the boxed area of the fuel tank.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the tank area in wings for damage to plywood tank support and wing spars. Remove fuel tanks and inspect plywood supports and spars; replace poor condition supports with new plywood. Repair or replace spars affected by moisture. Drill three 3/16 inch diameter drain holes in plywood supports for drainage.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
not later than next periodic inspection
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
WACO Model UKS-7, VKS-7, and VKS-7F Aircraft
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Wing inspection (tank area)
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_47-27-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-27-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; WACO Model UKS-7, VKS-7, and VKS-7F Aircraft Subject: Wing inspection (tank area) Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Waco Aircraft Company, The Model: UKS-7 | VKS-7 (Army UC-72D) | VKS-7F Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 47-27-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-27-01 SUBJECT HEADING: Airworthiness Directives; WACO Model UKS-7, VKS-7, and VKS-7F Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-27-01 WACO: (Was Mandatory Note 4 of AD-648-1.) Applies to Models UKS-7, VKS-7, VKS-7F Aircraft. Compliance required not later than next periodic inspection. Inspect tank area in wings for damage to plywood tank support and wing spars caused by collection of moisture in the boxed area of the fuel tank. 1. Remove the left and right fuel tanks and inspect the condition of the plywood tank support and the front and rear spars. 2. If the plywood supports are found to be in poor condition they should be replaced using new plywood. 3. If the spars have been affected by the accumulated moisture, repairs should be made in accordance with FAA requirements or in extreme cases the spar should be replaced. 4. In order to provide drainage of the tank compartment three holes 3/16 inch in diameter should be drilled through the plywood support at the extreme rear of the support as close to the rear spar as possible without damaging the spar. These drain holes should, of course, extend through the fabric covering. 5. The drain holes should be drilled in all tank compartments at the time the fuel tanks are removed for this inspection. (The above inspection and recommended remedial measures also covered by Waco Aircraft Co. Service Letter No. 3.) FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_47-27-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-27-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; WACO Model UKS-7, VKS-7, and VKS-7F Aircraft Subject: Wing inspection (tank area) Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Waco Aircraft Company, The Model: UKS-7 | VKS-7 (Army UC-72D) | VKS-7F Product Type: Aircraft Product Subtype: Small 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: 47-27-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-27-01 SUBJECT HEADING: Airworthiness Directives; WACO Model UKS-7, VKS-7, and VKS-7F Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-27-01 WACO: (Was Mandatory Note 4 of AD-648-1.) Applies to Models UKS-7, VKS-7, VKS-7F Aircraft. Compliance required not later than next periodic inspection. Inspect tank area in wings for damage to plywood tank support and wing spars caused by collection of moisture in the boxed area of the fuel tank. 1. Remove the left and right fuel tanks and inspect the condition of the plywood tank support and the front and rear spars. 2. If the plywood supports are found to be in poor condition they should be replaced using new plywood. 3. If the spars have been affected by the accumulated moisture, repairs should be made in accordance with FAA requirements or in extreme cases the spar should be replaced. 4. In order to provide drainage of the tank compartment three holes 3/16 inch in diameter should be drilled through the plywood support at the extreme rear of the support as close to the rear spar as possible without damaging the spar. These drain holes should, of course, extend through the fabric covering. 5. The drain holes should be drilled in all tank compartments at the time the fuel tanks are removed for this inspection. (The above inspection and recommended remedial measures also covered by Waco Aircraft Co. Service Letter No. 3.) FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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