Army aviation safety messages: SOF and ASAM, explained

A safety-of-flight (SOF) message is a high-priority Army notice about a defect or hazardous condition, actual or potential, that can cause injury, death, or damage to aircraft. An aviation safety action message (ASAM) carries maintenance, technical, or general information about a lower-risk condition. AR 750-6, Army Equipment Safety and Maintenance Notification System, dated January 12, 2018, sets the policy, and the Army Publishing Directorate record lists it as active. AR 95-1, Flight Regulations, dated March 22, 2018, covers both in chapter 6 and has the Aviation and Missile Command (AMCOM) report the conditions for issuing them.

Two regulations, two risk bands

AR 750-6 covers aviation and ground equipment alike. For aircraft, SOF messages apply where an initial medium-to-high risk determination has been made under AR 385-10 or an approved risk matrix. ASA messages, as AR 750-6 abbreviates them, apply to a low-to-medium risk condition and have lower priority. Ground equipment has parallel messages: safety-of-use for the higher tier and ground safety action for the lower.

AR 95-1 describes the same split with different words. Paragraph 6-1 calls the SOF tier "moderate to high" and the ASAM tier "low- to moderate-risk." SOF messages require immediate action before the next operation. ASAMs do not require immediate action and, as far as possible, mitigate operational impacts.

Below both tiers sit maintenance messages that are not about safety. AR 750-6 calls them maintenance action (MA) and maintenance information (MI) messages. MI messages are permissive, and all their content is optional for the recipient.

Categories and what they do to an aircraft

Each tier has categories. Under AR 750-6, the category also sets the aircraft status symbol defined in DA Pam 738-751, the aviation maintenance records pamphlet dated February 28, 2014.

Message	Category	Effect
SOF	Emergency	Grounds an entire fleet, or a designated portion, at once; always followed by an operational or technical message
SOF	Operational	Restricts capabilities or sets reduced limits; typically a circled X
SOF	Technical	Grounds a fleet or portion for workmanship or materiel defects; typically a dash
ASA	Maintenance mandatory	Directs maintenance actions or updates technical manuals
ASA	Operational	Covers operation, procedures, limits, or policy
ASA	Informational	Gives status and information

A circled X lets an aircraft fly under stated restrictions. A dash means its condition is unknown and corrective action is needed as soon as possible. DA Pam 738-751 adds that a maintenance mandatory or operational ASAM, when received, also takes a dash.

Who releases and who waives

Under AR 750-6, the commanders of the Army Materiel Command's life cycle management commands release all messages and approve all but emergency safety messages. For an emergency message, the Chief of Staff of the Army or the Vice Chief evaluates the materiel risk and readiness impact, approves the message, and may authorize continued use of equipment with a materiel defect. AR 95-1 makes the Chief or Vice Chief the high-risk acceptance authority when a defect would ground all or most of a fleet.

Exceptions are narrow. An Army command, Army service component command, or direct reporting unit commander, not below major general under AR 750-6, may grant a temporary waiver only when combat operations or life-or-death emergencies are so urgent that they override the consequences of continued operation. The life cycle management commander may approve other waivers, except for messages that ground a fleet or part of one.

From message to logbook and manual

DA Pam 738-751 turns each message into records. Units enter every SOF message and ASAM on DA Form 2408-13-1 when it arrives, except informational ones, then act as the message directs. Compliance goes on DA Form 2408-15, the aircraft historical record, or on DA Form 2408-5-1 for reportable components. Recurring inspections go on DA Form 2408-18, and units report compliance through the AMCOM Message Tracking System. Only quality control technical inspectors may sign off the initial status symbols of messages that call for a visual inspection. A message not entered on DA Form 2408-13-1 or the historical records indicates noncompliance. The 2014 pamphlet says aviation maintenance action message where AR 750-6 (2018) says maintenance action message.

Messages also reach the manuals. Maintenance mandatory messages can update technical manuals, and life cycle management commands prepare the publication changes. When a safety message requires a materiel change, the command prepares a modification work order strategy within 30 days. AR 750-1, dated April 29, 2026, makes completed emergency SOF messages part of the Army maintenance standard.

Two cases from the record

A July 23, 2020 AMCOM story describes one SOF message. Artisans at Corpus Christi Army Depot found a non-conforming honeycomb seal in a Black Hawk engine. AMCOM, the Combat Capabilities Development Command Aviation and Missile Center, and Program Executive Office-Aviation generated an SOF message for the whole Army aviation enterprise, because the seal could cause an in-flight engine failure. The message required suspect engines to be removed and disassembled for inspection before the aircraft could fly again. Kevin Pulliam of the Aviation Turbine Engines Project Office said the process averted at least one mishap that summer.

A March 6, 2023 army.mil story records a Chinook case. In August, the story says, the Army grounded its entire CH-47 fleet after a series of engine fires caused by faulty O-ring components. Maintainers in one combat aviation brigade had its Chinooks flying again "in a matter of days." The story does not say which type of message carried the grounding.

What to check

• Is the message a SOF, an ASAM, or a non-safety maintenance message, and which risk band does it state?
• Does a grounding message come from the Chief or Vice Chief of Staff of the Army, as an emergency message requires?
• Was the message entered on DA Form 2408-13-1 on receipt, and is compliance on DA Form 2408-15 or DA Form 2408-5-1?
• Was any waiver granted by a commander not below major general, and only for combat or a life-or-death emergency?
• Has a maintenance mandatory message reached the technical manual, and does the aircraft's -10 carry its related SOF messages?

Azcuna's ELLMENT for the CH-47 puts the Chinook's public technical manuals, the Army sling-load manuals and a unit's own SOPs on a laptop or tablet that answers a repairer's or flight engineer's question with no network and cites the manual and page. Azcuna submitted it as a concept white paper to the Army's xTech|Search 10 competition in October 2026.

Sources

1. 1AR 750-6, Army Equipment Safety and Maintenance Notification System · Headquarters, Department of the Army, January 12, 2018
2. 2Record Details for AR 750-6 · Army Publishing Directorate
3. 3AR 95-1, Flight Regulations · Headquarters, Department of the Army, March 22, 2018
4. 4DA Pam 738-751, Functional Users Manual for the Army Maintenance Management System-Aviation · Headquarters, Department of the Army, February 28, 2014
5. 5AR 750-1, Army Materiel Maintenance Policy · Headquarters, Department of the Army, April 29, 2026
6. 6Safety of Flight messages save lives · U.S. Army Aviation and Missile Command, via DVIDS, July 23, 2020
7. 7Task Force Mustang Maintainers Sustain CENTCOM Flight Ops · U.S. Army (army.mil), March 6, 2023

Where this shows up in our work

• ELLMENT for the CH-47 Chinook answers a repairer's or flight engineer's question from the Chinook's manuals and the Army sling-load manuals and cites the page, with no network.
• TRACE, the offline S1000D and IETM viewer opens S1000D, MIL-STD-3001 and PDF technical manuals on a tablet with every marking intact.