AAC Corrosion Prevention and Control 3

Question 1

What is stress corrosion cracking (SCC) and what conditions promote its development?

Accepted Answer

Cracking that occurs when sustained tensile stress and a corrosive environment act simultaneously on a susceptible metal

Answer

Rapid surface oxidation caused by high-velocity airflow over exposed metal components

Answer

Fatigue cracking caused by repeated mechanical loading and vibration cycles alone

Answer

Corrosion that forms exclusively around welded joints under elevated thermal stress

Question 2

What type of primer is specified for use on Army aircraft to provide corrosion protection beneath the topcoat paint system?

Accepted Answer

Epoxy polyamide primer with corrosion-inhibiting pigments such as strontium chromate

Answer

Oil-based alkyd primer for general metal surfaces

Answer

Water-based latex primer compatible with aluminum surfaces

Answer

Acrylic lacquer primer for rapid application in field conditions

Question 3

What inspection techniques are required when checking for corrosion in hidden or inaccessible areas of an Army aircraft?

Accepted Answer

Borescope inspection, moisture testing, and checking drain holes for obstruction

Answer

Visual inspection of only exterior painted surfaces for bubbling or discoloration

Answer

Reviewing maintenance records to determine if corrosion was previously documented

Answer

Inspecting only high-stress structural members using depot-level X-ray equipment

Question 4

Under Army maintenance regulations, who is authorized to perform corrosion treatment on aircraft structural components?

Accepted Answer

Qualified aviation mechanics with the appropriate MOS and documented training on the specific aircraft

Answer

Any soldier assigned to the aviation unit who has completed basic military training

Answer

Pilots who hold a maintenance test pilot (MTP) designation and aircraft qualification

Answer

Only depot-level maintenance technicians regardless of the corrosion severity level

Question 5

What must be done after treating corrosion on an Army aircraft to restore protection to the affected area?

Accepted Answer

Restore the full protective finish system including primer and topcoat paint per technical manual specifications

Answer

Apply a new layer of corrosion inhibiting compound only, without repainting the surface

Answer

Apply a clear lacquer overcoat to seal the treated bare metal area

Answer

Leave the treated area as bare metal to allow monitoring for corrosion recurrence

Question 6

How must corrosion findings and treatment actions be recorded in the Army aviation maintenance documentation system?

Accepted Answer

Recorded in TAMMS-A using DA Form 2404 for the discrepancy and DA Form 2408-13-1 for the corrective action

Answer

Verbally reported to the oncoming crew during shift handover with no written record

Answer

Entered in the pilot's flight log as a maintenance advisory note

Answer

Reported only if corrosion exceeds Level 2 severity as determined by the crew chief

Question 7

Why is the galvanic series an essential reference tool for Army aircraft corrosion prevention?

Accepted Answer

It ranks metals by electrochemical potential, indicating which metal will corrode when dissimilar metals are placed in contact

Answer

It specifies the order in which corrosion treatment maintenance tasks must be performed

Answer

It defines the gallon quantities of corrosion inhibitor compound required per specific aircraft model

Answer

It classifies Army aircraft into risk categories based on their operational environment