Army Hazardous Events Scale – Army-HES

Run so low on fuel that you were seriously concerned about making it to an airfield/heliport or refueling point before you ran out?

Made a precautionary or forced landing at an airfield/heliport other than your original destination?

Made a precautionary or forced landing away from an airfield/heliport?

Been forced to perform an abrupt maneuver to avoid an obstacle?

Become so disoriented that you had to land or call ATC for assistance in determining your location?

Had a mechanical failure that jeopardized the safety of your flight?

Had an engine quit because of fuel starvation, either because you ran out of fuel or because of an improper pump or fuel tank selection?

Flown into areas of instrument meteorological conditions, when you were not on an instrument flight plan?

Turned back or diverted to another airport because of bad weather while on a VFR flight?

Experienced icing so severe that you had to divert or change altitude?

Noticed that you were significantly undershooting your approach to landing?

Attempted to hover in ground effect and discovered you had insufficient power?

Experienced vertigo so severe that you had to pass control of the aircraft to the other pilot?

Taken off when you knew you were over the maximum gross weight limit for the conditions?

Had a crewmember become ill or incapacitated during flight, to the extent that they could not fully perform their duties?

Penetrated a gun-target line without clearance?

Lost visual contact with the ground because of dust or snow while landing or taking off (brown-out)?

Descended below the MDA while on an instrument approach without having the airfield in sight?

Descended more than two dots below the glideslope while on an ILS approach?

Drifted more than two dots to the left or right of course while inside the outer marker on an ILS approach?

Failed to complete the before-landing checklist while landing at an airfield/heliport?

Experienced an in-flight fire or smoke in the cabin?

Failed to follow ATC/tower instructions?

Taken off without clearance from a controlled airfield/heliport?

Entered or crossed an active runway without clearance?

Had cargo shift while in-flight?

Landed without clearance at a controlled airfield/heliport?

Experienced an electrical failure during night flight?

Lost one or more of your primary flight instruments (gyro failure, altimeter failure, etc.) during instrument flight?

Experienced wake turbulence from other aircraft that resulted in near loss-of-control?

Lost cyclic authority while hovering (lateral load exceeded)?

Lost anti-torque authority while hovering?

Attempted to hover out of ground effect, and discovered you had insufficient power?

Noticed that you were drifting significantly to one side during your approach to landing?

Discovered live ordnance left on board after a flight?

Grazed trees (or other objects) while flying low-level?

Struck an object with the main rotor while hovering?

Experienced a near mid-air collision?

Experienced a near collision while taxiing or hovering?

Nearly collided with the ground or some object while flying?

Had your aircraft slide after landing on a slope or smooth rocks?

Unexpectedly had your aircraft tip significantly after landing on a slope?

Experienced a hard landing?

Executed a go-around after encountering brown-out or white-out conditions during the last portion of your approach to landing?

Made a zero-visibility take-off in which you immediately lost visual contact with the ground while pulling pitch because of brown-out or white-out?

Came close to hitting terrain or some other obstacle after inadvertently entering instrument meteorological conditions?

Narrowly avoided a wire-strike?

Followed an instruction meant for another aircraft because of confusion over call signs?

Became so fatigued while flying that you had difficulty remaining alert and performing your duties?

Were asked by a ranking passenger to perform an action that you believed was contrary to the safety of flight?

Became so ill during a flight that you could not perform your duties?

Struck a large bird while in flight?

Experienced much worse weather reroute or at your destination than was forecast?

Made a significant navigation error that could have taken you into rising terrain, an enemy controlled area, or otherwise seriously jeopardized the aircraft/mission?

Experienced a failure of your night vision device during a critical phase of flight (for example, while on approach to an LZ or while maneuvering low-level)?

Had a significant dispute with the other pilot regarding what course of action should be taken?

Found that you and the other pilot had a very different mental picture of what was going on in or around the aircraft (for example, your position relative to friendly and enemy forces, the location of the next navigation fix)?

Flown with a pilot, outside of a training situation, who did not seem to have the skills needed to fly the aircraft and accomplish your mission?

Encountered turbulence so severe that you had significant difficulty maintaining control of the aircraft?

Discovered after a flight that some important part of the aircraft had been damaged without your being aware of it?

Had a weapon accidentally discharge in your aircraft?

Had the other pilot perform some action that was completely unexpected and might have jeopardized the safety of your flight?

Been forced to perform a go-around because of dust/brownout in the landing area?

Experienced a wire strike?

Had a radio communications failure that jeopardized the safety of your flight?

Discovered during a flight that you did not have the correct frequencies and/or call signs required for communication with ground personnel?

Lost communications with another member of the crew during some critical phase of flight?

Realized afterward that you had followed the wrong procedure for an emergency or near emergency situation?

Discovered that neither you nor the other pilot had the controls?

Misinterpreted some statement or request by the other pilot or a crewmember leading to an unsafe condition?

Exceeded the airspeed, power, or RPM limitations of your aircraft?

Had the other pilot misunderstand some statement or request that you made, leading to an unsafe condition?

Noticed that the other pilot or a crewmember was doing something wrong, but did not correct them?

Experienced a lightning strike on the aircraft during flight?

Discovered during a flight that you did not have the correct maps for your route and/or destination?

Experienced a smoke or fire indicator that was not a false alarm?

Allowed a non-rated person to fly the aircraft?

Had a hard landing resulting in a maintenance inspection before flight could continue?

Taken off without checking the weather and/or NOTAMS?

Discovered that a cowling or hatch was not secured prior to flight?

Inadvertently moved the control (cyclic, collective, or control wheel) when you were not the pilot flying the aircraft?

Had a flight control bind or stick?

Performed more than two unsuccessful approaches to landing at the same location during a single mission?

Performed unauthorized aerobatics, return to target maneuvers, or buzzed ground vehicles?

Made a serious error in reading or interpreting an instrument, but later realized your mistake?

Performed a terrain (low-level) flight without having documented all the hazards on your maps?