4 - MHAs.pdf
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- Solicitation number
- 80JSC024CLDSAFETYTIM
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This document is a technical presentation on Maintenance Hazard Assessments (MHAs). It provides an overview of what an MHA is, why it is needed, and when it should be initiated. Key points include:
An MHA is a safety assessment that documents hazards applicable during maintenance activities, such as safe access, contamination/leakage risks, and verification of safety-critical features. MHAs should be considered at each phase of a project's flight safety review to anticipate future on-orbit maintenance or removal and replacement activities.
The presentation is related to a federal contract opportunity for NASA's Commercial Low Earth Orbit (LEO) Development Program, which is seeking industry input on Destination and Payload Safety requirements for commercially owned and operated space systems that can support NASA astronauts and other spaceflight participants in LEO. The event will be held on August 13-14, 2024 at the Johnson Space Center in Houston, TX. Interested parties must RSVP by August 9, 2024 and are limited to 5 in-person attendees per company.
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Maintenance Hazard Assessments (MHAs):
“W 3: What, Why, and When”
JSC\NE P. Nielsen, NASA ISRP Executive Officer (XO) JSC\NE R. Guidry, NASA ISRP XO
JSC|NE P. Mitchell, NASA ISRP XO
Version 6, (06/05/2024)
TOPICS:
• What is an MHA?
• Why is it needed, and what should it consider/include?
• When should MHAs be initiated?
• Recommended tips to include in an MHA
• Backup – Previous SRP/PSRP Policy Letters
What is an MHA?
• An MHA is a safety assessment which documents hazards that are applicable during maintenance activities.
• Examples include:
o Replacing air filters (preventative maintenance) o Replacing failed ORUs (corrective maintenance)
Why is it needed, and what should it consider/include?
• There are three important aspects that are documented via an MHA:
1. An MHA documents safe access hazards such as sharp edges, accessibility, touch temperature, stored energy, and electrical shock, that may be present during maintenance activities.
• If this area/volume was never meant to be accessed by the crew, has the volume been assessed for sharp edges, pinch points, etc.?
• Does the hardware require a cool-down time prior to access?
• Does the hardware need to be powered down and possibly demated prior to access?
2. An MHA addresses possible hazards created during maintenance activities, such as contamination or leakage.
• The solenoid valve which controls the amount of coolant fluid that goes to a specific piece of hardware has failed and requires replacement. Replacement of the valve will require disconnecting fluid lines which could expose the crew to a toxic fluid. Does the crew require specific PPE during this task?
3. An MHA addresses the approach for verification or reverification of safety critical features that may be modified during maintenance and that will be required during subsequent operations.
• The fittings for the fluid lines to the solenoid valve may require tightening to a specific torque value along with the fasteners that mount the valve to structure.
When should MHAs be initiated?
MHAs should be considered, developed, and presented at each phase of the project’s flight safety review to help anticipate future on-orbit maintenance or removal and replacement (R&R) activities.
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