The background of this incident involves a trim wheel malfunction on a Cessna 152 during a pre-test revision lesson for a PPL course. 1. Situation The instructor and the student were flying a Cessna 152 to the northwest of their home airfield, which had ful...

The background of this incident involves a trim wheel malfunction on a Cessna 152 during a pre-test revision lesson for a PPL course.

1. Situation

The instructor and the student were flying a Cessna 152 to the northwest of their home airfield, which had full ATC coverage. The weather was clear with few clouds and a moderate south-westerly wind.

Everything was going smoothly until the student noticed that the trim wheel was jamming and would only move in the nose-down direction.

2. Task

The task was to conduct a pre-test revision lesson in preparation for the student's PPL check ride.

This involved performing various maneuvers and checks to ensure the student was ready for the test.

3. Action

The instructor took control to verify the problem but inadvertently made it worse by adding more nose-down trim without a way to reverse it.

This required significant back pressure on the control column to maintain level flight.

Deciding to terminate the lesson, control was returned to the student, who conducted a full flight control check to ensure the aircraft was manageable in all axes and at various speeds.

On the way back, the instructor informed ATC of their pitch control issue but did not request priority, considering the aircraft controllable despite the effort needed.

The instructor planned to issue a PAN PAN call if the student became fatigued, or a MAYDAY if the situation deteriorated.

4. Result

The aircraft made an uneventful approach and landed routinely on runway 23, with a slightly tired student onboard.

Investigation revealed a loose fitting had caused the trim wheel to jam in the nose-down direction.

ATC had misunderstood the "pitch control" issue as a radio problem, despite clear communication.

A subsequent safety meeting debated whether a PAN call was necessary, but the instructor felt it wasn't as the aircraft's safety was not compromised unless fatigue set in or the problem worsened.

The lesson learnt is to carefully consider when to issue emergency calls and ensure clear communication with ATC to avoid misunderstandings.

Warning signs to notice earlier

• Trim movement is asymmetric, stiff or restricted instead of matching the normal feel and range.
• A troubleshooting input increases the out-of-trim condition or the force needed to hold attitude.
• The person flying is becoming physically tired while the aircraft still appears controllable.

Decision analysis

The first decision is whether more manipulation will clarify the fault or make it worse. Once the abnormal direction and effect are understood, repeated testing can consume control margin. Aircraft control, a conservative speed and configuration, and an early landing deserve priority over diagnosing the mechanism in flight.

Workload should be divided explicitly. The person flying maintains attitude and reports increasing effort; the other pilot checks the approved procedure, communicates and prepares the landing. If fatigue or controllability changes, the urgency of the communication and landing plan must change with it.

Safer alternatives to discuss

Discuss the nearest suitable landing options, how configuration changes could alter control force, and which approved checklist applies to the exact trim installation. Consider whether a straight-in or longer runway would reduce manoeuvring, while avoiding a generic prescription that ignores wind, traffic and aircraft limitations.

Instructor or group debrief

1. What action first made the condition worse?
2. How would increasing fatigue be detected and communicated?
3. Which landing option minimises manoeuvring and configuration changes?
4. Where is the aircraft-specific abnormal procedure found?

Do not copy actions from this learning scenario into an aircraft checklist. Transfer the decision-making lesson, then use current official information, approved aircraft procedures and qualified instruction for the operation itself.