- 1 What is flush patch in aviation?
- 2 What is flush patch?
- 3 What are two classifications of skin patches?
- 4 What is the first step in aircraft structure repair?
- 5 What is a doubler in aviation?
- 6 Why is so important to repair aircraft damage immediately?
- 7 What is scarf repair?
- 8 How is bonded repair conducted?
- 9 How do you repair a composite?
- 10 What are the 3 types of lesions?
- 11 What are the two types of lesions?
- 12 What are the 7 different types of eczema?
- 13 What is scratch in aviation?
- 14 What is the smallest allowable rivet pitch?
- 15 What is sheet metal in aviation?
What is flush patch in aviation?
Flush Patch. A flush patch is a filler patch that is flush to the skin when applied it is supported by and riveted to a reinforcement plate which is, in turn, riveted to the inside of the skin.
What is flush patch?
A flush patch consists of a filler patch that is flush with the skin after it is inserted. It is backed up and riveted to a reinforcement plate that, in turn, is riveted to the inside of the skin. This reinforce-ment plate is usually referred to on some repair diagrams as the doubler or the backup plate.
What are two classifications of skin patches?
A skin lesion is an abnormal growth or rash on the skin as compared to normal skin. There are two main categories of skin lesions: primary and secondary lesions. Primary skin lesions are abnormal skin conditions that may be present at birth or acquired later.
What is the first step in aircraft structure repair?
The first step in the repair process is the removal of existing fasteners, some of which may have already been removed during the damage evaluation phase. Sometimes, the paint layer may have to be removed in order to see the rivets clearly.
What is a doubler in aviation?
Doubler. A piece of sheet metal used to strengthen and stiffen a repair in a sheet metal structure. Report an issue with this definition. source: FAA Aviation Maintenance Technician Airframe Handbook (FAA-H-8083-31) Ace Any FAA Written Test!
Why is so important to repair aircraft damage immediately?
The satisfactory performance of an aircraft requires continuous maintenance of aircraft structural integrity. It is important that metal structural repairs be made according to the best available techniques because improper repair techniques can pose an immediate or potential danger.
What is scarf repair?
Scarf repairs are the preferred method of repairing composite structures, especially when externally bonded patches can no longer meet the stiffness, strength, and flushness requirements. From: Bonded Joints and Repairs to Composite Airframe Structures, 2016.
How is bonded repair conducted?
The bonded repair can take the form of either an external patch, internal patch or a flush scarf or stepped repair as described in MIL-HDBK-17-3F 3. To implement the flush repairs, the process begins with the removal of the damage and the careful creation of a hole by the scarf or step method.
How do you repair a composite?
The steps involved in composite repair are:
- Detect and assess the damage.
- Identify component.
- Remove Paint.
- Design the repair.
- Obtain materials and tools.
- Remove the damaged area.
- Effect the repair.
- Allow proper curing time.
What are the 3 types of lesions?
Lesion Type (Primary Morphology)
- Macules are flat, nonpalpable lesions usually < 10 mm in diameter.
- Papules are elevated lesions usually < 10 mm in diameter that can be felt or palpated.
- Plaques are palpable lesions > 10 mm in diameter that are elevated or depressed compared to the skin surface.
What are the two types of lesions?
Two categories of skin lesions exist: primary and secondary. Primary skin lesions are abnormal skin conditions present at birth or acquired over a person’s lifetime. Secondary skin lesions are the result of irritated or manipulated primary skin lesions.
What are the 7 different types of eczema?
There are seven different types of eczema:
- Atopic dermatitis.
- Contact dermatitis.
- Dyshidrotic eczema.
- Nummular eczema.
- Seborrheic dermatitis.
- Stasis dermatitis.
What is scratch in aviation?
Scratches. (as applied to visual inspection of aircraft components) Scratches: shallow, thin lines or marks, varying in degree of depth and width, caused by presence of fine foreign particles during operation or contact with other parts during handling.
What is the smallest allowable rivet pitch?
The smallest allowable transverse pitch is 21⁄2 rivet diameters. The smallest allowable transverse pitch is 21⁄2 rivet diameters. Rivet pitch and transverse pitch often have the same dimension and are simply called rivet spacing.
What is sheet metal in aviation?
The aluminum alloys used in the construction of aircraft are very strong and relatively light in weight. Sheet metal construction is used on a large majority of aircraft in one form or another. Often tube and fabric airplanes will have aluminum cowlings, fairings, etc.