✈️ Aviation Brief — Issue #14
Weekly insights for student pilots and the instructors who train them.
THIS WEEK'S TOPIC
IA.V.A — ILS Approach (Instrument ACS)
### 1. ACS STANDARDS SUMMARY
From the FAA Instrument Airplane ACS (IA.V.A: ILS Approach), the examiner expects you to demonstrate a precision approach using an ILS to minimums, complying with ATC clearances. Key skills include:
- Establishing the proper aircraft configuration (e.g., gear down, flaps as needed) and airspeed.
- Intercepting and tracking the localizer course within ±10° (or 10% of full-scale deflection, whichever is less).
- Maintaining the glideslope within ½ scale division (or 10% of full-scale deflection, whichever is less).
- Scanning instruments properly, configuring for landing or executing a missed approach if required, and completing the task per published missed approach procedures. Risk management emphasizes stabilizing the approach by 500 feet AGL.
### 2. THREE COMMON STUDENT MISTAKES
- **Chasing the needles**: Students fixate on raw localizer/glideslope deviations, making constant heading or pitch corrections that cause oscillations—stay smooth and use a disciplined scan (attitude, airspeed, needles).
- **Unstable speed or configuration**: Entering the final approach segment too fast or slow, or delaying full flaps/gear, leading to crossing the threshold high/hot or sinking below glideslope—always stabilize by 500 feet.
- **Improper glideslope intercept**: Attempting to capture from above the glideslope (e.g., descending too early from a procedure turn), causing a hard breakout or false capture—verify you're established on localizer below the glideslope first.
### 3. CFI PRO TIP
"Before the glideslope comes alive, fully configure your Cessna 172 (gear down, full flaps, prop forward) and trim for your approach speed (around 80-90 KIAS). Then, use pitch to hold airspeed and power to control glideslope—think 'pitch plus power equals performance.' This keeps you stable without chasing, and practice it on every RNAV approach first to build the habit."
### 4. SAFETY SPOTLIGHT
NTSB data shows ILS approaches account for about 20% of fatal CFIT accidents in IMC, often due to unstable approaches where pilots press on below 500 feet despite glideslope deviations (e.g., NTSB ID: CEN13FA112, a Beechcraft Baron flew a botched ILS in low ceilings, landing short after ignoring an unstable profile). ASRS reports highlight "get-there-itis" leading to ignored missed approaches—always verbalize "stable or go missed" at 500 feet to break the cycle.
### 5. DID YOU KNOW
The ILS glideslope transmitter is typically located 750-1,250 feet beyond the runway threshold, angled at 3°—that's why you often see it 'come alive' slightly high on intercept, requiring a power reduction to track down to it accurately. Cat I minimums (like most at LAS-area airports) require 200-foot ceilings and ½-mile visibility for a reason: it ensures a safe visual segment.
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