History of Space Exploration: Chapter 6, Exercise 2 — Possible Solution
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PRECISE STATEMENT
An oxygen tank exploded at 55 hours 55 minutes; the landing was aborted, so the
mission's geological and lunar surface goals were not achieved. The crew
returned safely, splashing down on 17 April 1970, using the lunar module as a
lifeboat on a free-return trajectory.

WHY "FAILURE" IS TOO BROAD
It merges the mission objective (not achieved) with the outcome for the crew
(safe return). The review's recommendations were applied to Apollo 14.