MiG-21

Soviet single-seat multi role fighter.

 

Power plant: one Tumansky R-13-300 turbojet, rated at 73.6 kN, with afterburning.

Dimensions: wing span 7.15 m, length 113.46 m, height 4.10 m

Weight: empty 5.200 kg, maximum 9.400 kg

Speed: maximum level speed 2,230 km/h, max at S/L 1,300 km/h,

Range: 1,1oo km, ferry range 1,800 km         

Ceiling: 18,000 m

Armament: One twin-barrel 23 mm gun with 200 rounds; load for interceptor role includes four K-13A “Atoll” air-to-air missiles; fighter-bomber role includes up to 1,500 kg of bombs and rockets on wing pylons; reconnaissance version includes pods with gun camera, IC scanner and instrumentation.

 

 

MAINTENANCE TECHNOLOGY

-         EXTENSION OF TBO AND SERVICE LIFE

-         OVERHAUL

-         TECHNICAL ASSISTANCE

-         SPARE PARTS

On the basis of experience gained during the 30-year period of  MiG-21 aircraft exploitation, repair and maintenance in Yugoslavia, Aeronautical Plant “Moma Stanojlović’’ has developed procedures for gradual extension of time limitations for this type of aircraft.

 

Time limitation applies to structure as well as to aircraft accessories and equipment. Works on extension of time limitation are carried out at customer’s facilities

 

 

EXTENSION OF TBO AND SERVICE LIFE

 

A) Works

 

1. Analysis of customer’s technical qualification

2. Evaluation of customer’s aircraft technical condition

3. Implementation of works covers:

- Disassembly of accessories equipment

- Troubleshooting of aircraft structure and carrying surfaces

- Troubleshooting and repair of accessories and equipment depending on their

  technical condition and service life covered

- Works on structural repair and revitalization of carrying surfaces

- Implementation of bulletins

- Accessories and equipment assembly

- Aircraft ground testing and flight tests.

Based on the works performed:

-         MiG-21 aircraft is prescribed a new service life of 5 years or 500 flying      

             hours.

-         MiG-21 aircraft is prescribed calendar life of  40 years.

B) Purpose

-         Prolongation of aircraft service life according to purpose

-         Extension of TBO and service life until reaching values analogue to the    

             ones determined at overhaul.

C) Advantages

-         Individual approach to service life extension,

-         Elimination of transportation costs.

 

OVERHAUL

 

Overhaul comprises three main groups of works, each representing a complete whole.

 

I –   Preparatory works (aircraft acceptance, preliminary troubleshooting, disassembly works)

II –  Repair works on aircraft and components (structural repair, equipment repair)

III – Final works (assembly works, final check, painting and flight tests).

 

Upon completed works, aircraft, accessories and equipment are given  new TBOs.

 

 

TECHNICAL ASSISTANCE

-         Consultation on exploitation and current overhaul matters.

-         Transfer of know-how.

SPARE PARTS

 

-         Cooperation in supply of spares.