A hung start in a jet engine is often caused by

A hung start in a jet engine is often caused by

• A. Malfunctions in ignition system
• B. The starter cutting off too soon
• C. An excessively rich fuel/air mixture
• D. Low oil pressure

Answer: (B)

Hung start happens when the engine fails to accelerate to the speed and pressure needed for stable combustion after the start sequence. The starter provides the initial rotation and airflow, and the fuel control and ignition are timed to light off as the core reaches sufficient speed. If the starter is cut off too soon, the engine loses the momentum before it can reach self-sustaining speed, so fuel may be metered and ignition attempted but cannot be sustained. The result is the engine remaining at a low RPM in a hung state rather than continuing to spool up. Other issues like ignition system malfunction would typically prevent ignition outright rather than leaving the engine in a hung state; an excessively rich mixture can complicate starting but does not by itself explain the premature cutoff of the starter; low oil pressure is a symptom or fault that affects operation after start rather than causing the start to hang.

Hung start happens when the engine fails to accelerate to the speed and pressure needed for stable combustion after the start sequence. The starter provides the initial rotation and airflow, and the fuel control and ignition are timed to light off as the core reaches sufficient speed. If the starter is cut off too soon, the engine loses the momentum before it can reach self-sustaining speed, so fuel may be metered and ignition attempted but cannot be sustained. The result is the engine remaining at a low RPM in a hung state rather than continuing to spool up.

Other issues like ignition system malfunction would typically prevent ignition outright rather than leaving the engine in a hung state; an excessively rich mixture can complicate starting but does not by itself explain the premature cutoff of the starter; low oil pressure is a symptom or fault that affects operation after start rather than causing the start to hang.