Category B3 Licence Privileges

1. What is Category B3?

Category B3 is an aircraft maintenance licence category specifically designed for technicians working on piston-engine, non-pressurised aeroplanes with a Maximum Take-Off Mass (MTOM) of 2,000 kg or below.

In simple words, Category B3 is for maintaining smaller, non-pressurised, piston-engine aircraft.

2. Scope of B3 Privileges

A Category B3 licence holder has privileges covering:

Area

Privileges

Aircraft structure

Maintenance of aircraft structures

Engine

Piston-engine maintenance

Mechanical systems

Landing gear, flight controls and other mechanical systems

Electrical systems

Aircraft electrical systems

Avionics

Simple tests to prove serviceability

Important: Avionics privileges are limited to tasks requiring simple tests. They do not include complex avionics troubleshooting.

3. Relationship Between B3 and A1.2

One important examination point:

  • Category B3 does not automatically include a Category A sub-category.

  • However, B3 licence holders may exercise privileges for tasks typical of Category A1.2, subject to the applicable licence limitations and maintenance organisation authorisation.

4. Remember for DGCA Examination

B3 = Small Piston Aircraft

  • B – Maintenance licence category

  • 3 – Piston-engine, non-pressurised aeroplanes

  • 2,000 kg – Maximum MTOM

  • A1.2 – Typical Category A task privileges, subject to limitations

5. Quick Knowledge Check

Q1. Category B3 applies to which aircraft?

a) Turbine-engine pressurised aeroplanes

b) Piston-engine non-pressurised aeroplanes

c) Helicopters

Correct answer: b)

Q2. What is the maximum MTOM for Category B3?

a) 1,500 kg

b) 2,000 kg

c) 5,700 kg

Correct answer: b)

Q3. Does Category B3 automatically include a Category A sub-category?

a) Yes

b) No

c) Only A1

Correct answer: b)

Instructor's Final Message

"Category B3 is your licence for maintaining small piston-engine aeroplanes. Remember three key points: Piston Engine, Non-Pressurised, and Maximum 2,000 kg MTOM."

Safety → Airworthiness → Procedure → Verification → Documentation → Communication.

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