PLT438: Regulations
What code PLT438 covers, why the FAA tests it, and how to study Regulations before your checkride.
Recall regulations - oxygen requirements
What this means for your checkride
The supplemental-oxygen rules are altitude and time based: from above 12,500 up to 14,000 ft cabin pressure altitude the required crew must use oxygen after 30 minutes; above 14,000 ft at all times; and above 15,000 ft passengers must be provided oxygen.
These thresholds are frequently tested because they are exact and safety-critical, so the FAA checks the altitudes and the 30-minute rule.
Candidates blur the thresholds. The 30-minute allowance applies only in the 12,500 to 14,000 ft band; above 14,000 ft the crew needs oxygen from the start.
Where to study it
A code on your test report is an area of deficiency. An authorized instructor must review it with you and endorse that review before you take the practical test, and the examiner may revisit it during the oral. Study it until you can explain it out loud, not just recognize the answer.