8AT-9939-00
Rotor trim angle gauge
Description
8AT-9939-00 Main rotor blade trim-tab angle gauge
8AT-9939-00 is a main rotor blade trim-tab angle gauge identified through the exact designation and specialist listings. Measuring the trim-tab or flap angle on Mi-8-family main rotor blades during tracking correction. This page describes the specific item and does not copy specifications from equipment that merely looks similar.
The Mi-8 manual requires blade trim tabs to be adjusted while checking their angle with gauge 8AT-9939-00. Later Mi-171 documentation records an indexed 8AT-9939-00V execution; the suffix must match the applicable maintenance document. This distinction matters in search and procurement: the base number, letter index, suffix and model reference should agree with the applicable documentation or the marking on the available item.
Full descriptionCollapse description
Maintenance role of 8AT-9939-00
The product is used as ground support equipment. It is not a universal tool simply because another fixture performs a comparable task. Before use, maintenance personnel should confirm the approved task card, serviceability, attachment or connection points, and the permitted aircraft or component configuration.
Measuring range, graduation and calibration interval were not found in a reliable public passport and are not inferred. When a value is absent from the located documentation, it is not replaced with a calculation or a specification from a neighbouring model. This keeps the page technically accurate and allows the customer to request a passport, drawing or test record separately.
Designation and compatibility checks
Before ordering, compare 8AT-9939-00 with the maintenance manual, ground-equipment catalog or delivery-set list. Also verify interfaces, working medium, load or pressure range, included accessories and periodic inspection requirements whenever those characteristics apply to this type of equipment.
Products linked within the same category may support the same aircraft family, but they are not substitutes. A jack, crane, trolley, valve or servicing control unit performs its own operation and must be used only in the documented configuration.
Confirmed and unconfirmed technical data
Function and use in blade tracking adjustment are confirmed by Mi-8/Mi-171 manuals; metrological specifications require the gauge passport. Unverified dimensions, mass, pressure, rated capacity or applicability are intentionally omitted. Where a reference value is shown, the text identifies its status and requires confirmation against the passport for the supplied unit.
Incoming inspection should check the identification marking, body and joint condition, completeness, fasteners, hoses, cables, locks and working elements as applicable. Operational readiness is established through records and the approved inspection procedure, not appearance alone.
A technical inquiry is more useful when it includes the manual or equipment-list page that names 8AT-9939-00, together with photographs of the marking and interfaces on the existing sample. This helps separate the base model from a suffix-specific execution and allows the delivery set to be agreed in advance. For lifting, pumping or pressure-control equipment, the request should also state the required current inspection or test documentation.
Before release to service, a new or stored item should pass the recipient’s approved incoming inspection. Mechanical fixtures require checks for deformation, corrosion, thread damage and locking parts. Hydraulic equipment requires confirmation of fluid compatibility, seal condition and leakage control. Valves and servicing panels require clean passages, correct connections and functional control checks. The operator’s documentation determines subsequent inspection intervals.
Ordering and supply of 8AT-9939-00
The card uses YOM 2026, Warranty: 6 Months and Pre-Order status. The existing WooCommerce price and stock state are preserved. A useful inquiry should include the exact designation, quantity, maintained aircraft or component, required delivery set and any need for a passport, certificate, drawing or test report.
More products are available in the Ground Support Equipment category. Internal links are provided for navigation between related maintenance items and do not claim interchangeability.
Aircraft reference: Mil Mi-8. It does not replace approved technical documentation.
Related products for category navigation: 8AT-9937-00, 8AT-9940-00, 140-9940-00, 24-9940-10. They may support the same maintenance workflow but are not interchangeable.
Technical details
- Product Type
- Main rotor blade trim-tab angle gauge
- Designation
- 8AT-9939-00
- Alternative Designations
- 8AT-9939-00; 8AT.9939.00; 8AT-9939-00V; rotor blade trim gauge
- Function / Application
- Measuring the trim-tab or flap angle on Mi-8-family main rotor blades during tracking correction.
- Confirmed Technical Information
- The Mi-8 manual requires blade trim tabs to be adjusted while checking their angle with gauge 8AT-9939-00. Later Mi-171 documentation records an indexed 8AT-9939-00V execution; the suffix must match the applicable maintenance document. Measuring range, graduation and calibration interval were not found in a reliable public passport and are not inferred.
All specificationsCollapse specifications
- Data Verification Status
- Function and use in blade tracking adjustment are confirmed by Mi-8/Mi-171 manuals; metrological specifications require the gauge passport.
- Equipment Category
- Aircraft ground support equipment
- Estimated Lead Time
- 90–120 days; subject to confirmation
- Technical Documentation
- Product passport, drawing, maintenance manual and delivery records when available
Payment & delivery
Orders ship from our hub in Dubai. Partner stock is first transferred to Dubai, then shipped to you.
Dubai stock: 100% before dispatch. Partner stock (Remote stock) and Pre-order: 50% advance payment to start the order and 50% before shipment from Dubai to you.
Availability, lead time, delivery cost and payment terms are confirmed for your order before payment.
Payment & delivery terms


