A C-5M Galaxy cargo plane landed on its nose Thursday afternoon at Joint Base San Antonio-Lackland, but none of the 11 crew members was injured, the Air Force said.

The aircraft reported that its front landing gear did not deploy after a routine training flight.

“It’s very close to the Boeing hangars, so it used the majority — I would say — half of the runway,” said Maj. Timothy Wade, a spokesman for the 433rd Airlift Wing at JBSA-Lackland, adding that he could not say how badly the aircraft was damaged.

The accident is the first in years, but Wade couldn’t say when the last incident occurred. The Air Force Reserve wing flies eight Super Galaxy cargo planes, the largest in the the service’s inventory, and its 356th Airlift Squadron and 733rd Training Squadron routinely do training missions over San Antonio.

Another unit on the base, the 68th Airlift Squadron, does local training missions as well but often flies overseas.

The flight Thursday was a training mission that involved pilots, flight engineers and loadmasters. The crew discovered the nose gear wasn’t lowering, as it should, when it prepared to return for a landing at Lackland and declared an in-flight emergency.

Wade said he didn’t know if a fire broke out after the plane landed on the runway, but Air Force firefighters and security forces were on the scene. A board of officers will investigate the mishap.

The Air Force last summer ordered a stand-down of all 56 of its giant C-5 cargo planes to repair the nose landing gear. The order, given in early August by the Air Mobility Command, grounded the 433rd Airlift Wing’s Super Galaxies, which are often seen flying over U.S. 151 and U.S. 90 in Southwest San Antonio.

The mobility command ended the stand-down about a month after all the planes were examined and repaired. C-5 maintainers were told to replace ball screw assembly parts across the fleet to ensure compliance with standards of performance and maximize aircrew safety. The devices are in the nose landing gear.

At the same it grounded the planes to repair the landing gear, the command also issued a policy restricting kneel operations on all C-5 aircraft to mission-essential requirements only. Kneel operations allow the plane to be lowered close to the ground to facilitate loading and unloading.

That problem was fixed as well, said Wade, who could not elaborate about the potential causes of Thursday’s nose gear malfunction.

“All I can say is the incident is under investigation,” he said.