1977 Israeli Air Force CH-53 Crash

In May 1977, the Israeli Air Force was conducting a combined formation exercise in the Jordan Valley involving the Paratroopers Brigade.[1] The exercise included a flight-instructor training component, and IAF aircrew participating in a flight-instructor course were aboard the helicopter as part of their training.[1] The Yas'ur helicopter assigned to the mission had accumulated 1,058 flight hours and had been considered mechanically sound before the exercise began.[2]

At the staging area, preparations were described as hectic: soldiers readied themselves to board as helicopters started their engines and vehicles moved around the site.[2] The pilot, reserve Captain Moshe Witner, noted the high ambient temperature and, as required, ordered four soldiers not to board and reduced the helicopter's fuel load before departure.[2]

At approximately 8:40 p.m. on May 10, 1977, roughly three minutes after takeoff, the Yas'ur helicopter struck a hillside and crashed.[3] The crash site was about six kilometers north of Jericho, near Kibbutz Yitav.[3][4] All 54 people aboard were killed: 44 paratroopers from Company D of the May 1976 intake, and 10 Air Force aircrew members, including the helicopter's own crew and additional aircrew from the flight-instructor course.[1][3]

Rescue and search activity continued through the night, with flares dropped to illuminate the area and hospitals placed on alert.[2] On the Thursday following the crash, 49 of the 54 dead were buried in funerals held across the country.[2]

Among the surviving soldiers still in the field, the crash initially became known only as a report over the radio that a helicopter had fallen, without any immediate indication of who had been aboard.[5] A makeshift memorial was later assembled at the base. Two soldiers who had been presumed to be among the dead then appeared alive, prompting brief relief — until survivors counted those missing and realized that nearly the entire company had been lost.[5]

A commission of inquiry and an investigating judge both attributed the crash primarily to human error by the aircraft commander.[1] Investigators found that the helicopter had been above its permitted weight at the time of the flight, despite the pilot's pre-flight measures to reduce the load.[2] The inquiry also found that the pilot had flown lower than both IAF headquarters instructions and the exercise order permitted.[2]

The squadron commander, Eric Ben-Ari, had briefed pilots before the exercise to fly low at their discretion, depending on their judgment and the available lighting.[2][6] The Levin Committee concluded that this briefing "planted in the captains a motivation to fly lower and left them full discretion regarding the altitude of their flight," though it judged the link between the briefing and the crash insufficient for legal responsibility.[2] Ben-Ari was reprimanded by a military court in September 1977 and subsequently left the army.[2][6]

Investigators identified serious deficiencies at the launch site — including lack of discipline, negligence, improper management, and poor maintenance — but found no direct causal connection between those deficiencies and the crash, while noting they may have affected the pilot's alertness.[2] The commission also considered an engine shutdown unlikely as a cause.[2] The INSS account additionally identifies numerous broader command failures and departures from explicit IDF and Air Force authority and procedures in the management of the exercise.[1]

A 1997 Jerusalem Post retrospective reported that the committee of inquiry had determined the helicopter was overloaded and had flown too close to the ground.[7]

The disaster — one of the two worst aviation accidents in IAF history — prompted changes to operating standards.[1] The primary procedural lesson was a strict load limit: the permitted number of combat soldiers aboard a Yas'ur was capped at 33 following the finding that the aircraft had been overloaded.[1][2] Maintenance procedures were also substantially revised after the disaster.[4]

In 1978, a memorial was built at Givat HaN״D, approximately one kilometer south of Kibbutz Yitav and north of Jericho.[8][2] The monument is formed from stone and marble slabs arranged in the shape of the Hebrew letters נ״ד — the abbreviation for 54.[8][2] A metal plaque records the details of the event and carries the inscription "איך נפלו נ״ד גיבורים" ("How the 54 heroes fell"); another side of the monument lists the names of all those who died.[8] The event continues to be known in Hebrew as "אסון הנ״ד" — "Disaster of the 54" — a designation preserved in IDF archival records and Israel's official military commemoration registry.[9][8]

Bereaved families and friends disputed accounts placing primary responsibility on the pilot. They cited testimony about an earlier malfunction aboard the helicopter and alleged excessive overloading as factors the official inquiry underweighted.[5] Calcalist separately reported that technical failures were found in the aircraft and that helicopter maintenance procedures were substantially changed in the disaster's aftermath — an emphasis that differs from the inquiry's conclusion that an engine shutdown was unlikely.[4]

Families also accused squadron commander Eric Ben-Ari of bearing direct responsibility for planning the flight route and for failing to warn following aircraft of the hillside obstacle, noting that his own helicopter had passed the same rise only seconds before the crash.[6] The inquiry's findings as reported by Ynet placed low-level flying and the pilot's decisions at the center of the causal account, while the Levin Committee stopped short of holding the squadron commander legally responsible for his pre-flight briefing.[2]