Flying After Conducting an Aircraft Excessive Cabin Leakage Test.

Area of Science:

• Occupational health in aviation
• Aerospace medicine
• Diving physiology

Background:

• Aircraft engineers may perform tasks simulating diving conditions during ground maintenance.
• An Excessive Cabin Leakage Test (ECLT) can involve pressure changes analogous to underwater dives.
• Awareness of these risks is crucial for aviation medical specialists.

Purpose of the Study:

• To conduct an occupational risk assessment for aircraft engineers.
• To determine a minimum safe preflight surface interval (PFSI) after an ECLT.
• To evaluate the safety of flying after dive-equivalent maintenance procedures.

Main Methods:

• Utilized published dive tables to establish a minimum safe PFSI.
• Assessed the dive profile parameters (depth and bottom time) of the ECLT.
• Incorporated factors like altitude exposure and individual inert gas retention.

Main Results:

• The ECLT involves depths of 10-20 fsw and bottom times of 26-53 minutes.
• Standard dive tables indicate no required PFSI for this dive profile.
• Risk assessment identified potential hazards beyond standard dive table considerations.

Conclusions:

• While dive tables suggest no waiting period, a 24-hour PFSI is advised after ECLT.
• This recommendation accounts for factors including flight altitude and individual physiology.
• A bespoke risk assessment for the specific day's conditions is essential in the absence of a set policy.