✈️ Aviation Brief — Issue #23
Weekly insights for student pilots and the instructors who train them.
THIS WEEK'S TOPIC
PA.II.B — Engine Starting (Private Pilot ACS)
### 1. ACS STANDARDS SUMMARY
For Private Pilot ACS Task PA.II.B (Engine Starting), the examiner expects you to demonstrate starting the engine using the appropriate checklist while observing all manufacturer precautions (like those in the Cessna 172 POH). Key elements include verifying airworthiness requirements, following starting procedures (e.g., mixture rich, prime as needed, throttle cracked, clear prop), complying with engine limits (RPM, temps), and completing after-start procedures (oil pressure rise, avionics master on if applicable). Completion standards: The airplane is positioned correctly (clear of obstacles, pointed into wind if possible), engine starts smoothly without exceeding limits, parking brake or brakes hold during start, and you're ready for taxi with controls checked and transponder set.
### 2. THREE COMMON STUDENT MISTAKES
- **Not securing the brakes or parking brake properly**: Students often forget to firmly plant their feet on the brakes or set the parking brake before hitting the starter, causing the Cessna 172 to creep forward into the ramp clutter or another airplane—examiners ding this hard as it's a safety killer.
- **Incorrect priming or mixture setting for conditions**: In Vegas heat, over-priming a hot engine floods it (too much fuel), while cold mornings lead to under-priming and no-start cranks; students skip verifying ambient temp or recent shutdown time, wasting battery and risking hot starts over 1000°F.
- **Skipping the "clear prop" callout or visual scan**: Rookies hit the starter without looking left/right/behind or yelling "clear," missing ground crew, baggage carts, or tiedowns—checkride busts happen when examiners role-play as "obstacles" and you don't demonstrate awareness.
### 3. CFI PRO TIP
Always teach the "B-M-P-T-M-S" verbal flow for Cessna 172 starts—**B**rakes set, **M**ixture rich (or leaned for hot restarts), **P**rime (0-3 pumps based on temp), **T**hrottle 1/4 inch open, **M**aster on, **S**tarter engage—say it out loud every time. This builds muscle memory, catches skipped steps under stress (like checkride nerves), and turns a rote task into a confident habit that examiners love hearing.
### 4. SAFETY SPOTLIGHT
NTSB data shows over 50 prop-strike accidents yearly involving engine starts, often from unintended airplane movement when brakes slip on contaminated ramps (common in Vegas after summer monsoons). An ASRS report (Callback 456) detailed a C172 creeping into a fuel truck during start because the student didn't set the parking brake—pilot error led to $20K damage and a runway closure. Always double-check brakes hold with a firm toe press before clearing the prop.
### 5. DID YOU KNOW
In a hot Las Vegas summer (over 90°F), the Cessna 172's Lycoming engine often needs zero prime and mixture leaned during restarts to avoid vapor lock—per the POH, but students still default to cold-start habits, flooding it every time. This "hot start special" prevents 30-second cranks that overheat exhaust valves.
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