The Flight Nerd Weekly Briefing

Tuesday, September 29, 2026

01: Cockpit Voice Recorder

Fall flying season is officially here: cooler, denser air, smoother mornings, and climb performance that finally matches what the POH promised back in July. Of course, the universe balances things out, so the same week the air got better, the national average for full-service 100LL hit $7.69 a gallon. The FAA also picked this week to remind instrument students that the trusty spiral-bound testing supplement is headed for retirement, and it quietly handed out more new mechanic certificates than ever before. So grab a warm drink, because this week's news reads like a flight bag checklist: fuel, test prep, maintenance, and one very loud weekend on the California coast.

[[INSERT PAYWALL BREAK HERE]]

02: Radar Contact

A $308 Fill-Up Is Now "Average"

New fuel price data published September 25 puts the national full-service average for 100LL at $7.69 a gallon, based on 30 days of reporting from more than 3,200 FBOs. Jet A sits at $8.25, and the regional spread is wild: the Central region averages $7.00, while Alaska pilots are paying $11.61. A second data set from AirNav, drawn from about 3,500 FBOs, came in lower at $7.22, which tells you how much your number depends on where (and who) you buy from.

The so-what: at the average price, a 40-gallon top-off costs about $308, and fuel is often the single biggest line item on a rental or flight school invoice. If you're training, this is the moment to get serious about arriving at every lesson prepared, because ten minutes of confused ground work in a running airplane is money you'll never see again. And if you own, it's worth comparing self-serve prices at fields within a short hop; the savings on a regular basis can pay for a lot of $100 hamburgers.

Source: AVweb

The Instrument Written Is Ditching Its Paper Sidekick

Starting October 26, the Instrument Rating Airplane knowledge test will include image-based questions with figures embedded right on the screen, pulled from current sectional charts, instrument approach charts, and IFR low-altitude en route charts. That means the printed testing supplement is retired for the instrument exam as of that date. The FAA originally announced October 27 and later corrected it to the 26th, so if you're booked that week, double-check which side of the line you fall on. Other exams, including the private pilot test, keep their supplement for now, with the FAA promising ample notice before that changes.

The so-what: the old supplement figures were familiar, dated, and heavily memorized by test takers. The new images come from current charts, so the "I've seen this exact figure 40 times" advantage goes away. The fix is also the better habit: learn to actually read a real approach plate, not a recognizable picture of one. Private pilot students, consider this a preview of your future.

Sources: FAA Airman Knowledge Testing Matrix, FAA Testing Supplements

Record Mechanic Numbers, and Still Not Enough Mechanics

The FAA issued 11,103 new mechanic certificates in 2025, a 23.2% jump from the year before and the highest total on record. Aviation maintenance schools produced 7,496 of them, and enrollment grew 13.5% to 27,740 students. The catch: forecasters still project a North American shortfall of about 9,100 mechanics in 2026, growing to roughly 20,000 by 2030, and 44% of current certificated mechanics are over 60.

The so-what for GA: your annual inspection doesn't care how many 737s need wrenches, but the shop down the field competes for the same people. Longer wait times and higher shop rates are part of the cost of flying right now, so book your annual early and treat your A&P like the treasure they are. And if you know a mechanically minded teenager who loves airplanes, only 62% of A&P program seats are filled. That's an open door.

Source: AVweb

03: Briefing Room

Carb Ice Loves a Nice Fall Morning

Here's a scenario that catches students every autumn. It's 62°F, the sky is clear, there's dew on the wings, and you're cruising at 2,000 rpm feeling great about life. Nobody is thinking about ice. It's a perfect day.

Then the tach slowly slides to 1,900. You didn't touch the throttle.

That's carburetor ice, and cold weather isn't what causes it. As air speeds up through the carburetor's venturi, pressure drops, and fuel vaporization pulls even more heat out of the air. The temperature inside the carburetor can fall by as much as 60°F. On a humid fall morning, that's more than enough to freeze moisture right onto the throttle valve. The FAA's own guidance says carb ice is most likely below about 70°F with relative humidity above 80%, and it can still form on days as warm as 100°F.

The DPE trap is the carb heat test. Apply full carb heat and the rpm drops, because warm air is less dense. If ice was present, the rpm then gradually climbs as the ice melts. If you pull carb heat at the first rough moment and push it back in right away, you never let that recovery happen, and the engine may run rough for a bit as the melted water passes through. Examiners love asking you to explain why things briefly get worse before they get better.

If you want the full story on induction systems, fuel, and engine instruments the way examiners test them, the Private Pilot Ground School course walks through all of it: flightnerdairforce.com/private-pilot-ground-school-lifetime-access

04: Fly-In Radar

Pacific Airshow | October 2-4, 2026 | Huntington Beach, CA

This is the 10th year of the Pacific Airshow in Huntington Beach, and the lineup is heavy: the U.S. Air Force Thunderbirds, the Canadian Forces Snowbirds, the F-35A Demo Team, the RAF Falcons Parachute Team, Red Bull Skydivers, Mike Goulian, and Jeff Boerboon. The whole show flies over the ocean, inside an aerobatic box marked with buoys and patrolled by the Coast Guard. Gates open at 9 a.m., with flying from about 10:30 a.m. to 4:00 p.m. each day.

This one's in five days, so let's get tactical:

• There's no dedicated airshow parking. The show itself recommends rideshare, carpooling, walking, or biking. If you're driving, plan to arrive before the gates open, not before the first act.
• The show center faces the water to the southwest, so the afternoon sun ends up right over the action. Polarized sunglasses and a brimmed hat are not optional if you plan to watch the headliners.
• Free vs. paid: you can watch from the sand or the water for free, but you'll miss the live commentary and performer interviews, which only play inside the ticketed area. For first-timers, the commentary is half the fun.
• Ear protection, especially for kids. The Thunderbirds over water are loud in a way that video never captures.
• Flying in the area? Check the TFRs at tfr.faa.gov and your NOTAMs before any flight near the Orange County coast that weekend. This is busy Southern California airspace even on a quiet day.

Sources: Tickets, Official FAQ

Air Dot Show Atlanta | October 31-November 1, 2026 | Peachtree City, GA

One of the last stops of the Blue Angels' 2026 season, just days before their Pensacola homecoming finale. The rest of the confirmed lineup: the USAF F-35A Lightning II Demo Team, the USAF Heritage Flight, Michael Goulian, Greg Koontz, and the Full Throttle Formation Team. General admission group packages start around $32 per person, which includes one parking pass per package. Ramp box and Flight Line Club VIP pricing wasn't published as of this writing; check air.show/atlanta closer to the date.

Insider tips:

• The early bird sale is live now, with about 30% off event-day pricing. Five weeks out is exactly when to buy.
• Saturday is Halloween. If you have kids, plan on Sunday so you're not doing an airshow and trick-or-treating on the same day.
• General admission packages bundle parking. Since each group package includes just one parking pass, coordinate with your group before you buy so you're not stuck without a spot.

Source: Tickets and info

05: Pattern Work

Four questions this week, all from the FAA's own knowledge base. One easy, two medium, and one that will make you want to double-check your flight plan. No peeking at the answer key.

1. (Warm-up) Which flight instrument depends on the pitot tube for its reading?

A) Airspeed indicator only B) Airspeed indicator, altimeter, and vertical speed indicator C) Altimeter and vertical speed indicator only

2. The first indication of carburetor ice in an airplane with a fixed-pitch propeller would most likely be:

A) A drop in oil temperature and cylinder head temperature B) Engine roughness C) Loss of RPM

3. Under 14 CFR 91.17, no person may act as a crewmember of a civil aircraft with a blood alcohol concentration of:

A) 0.02 percent or greater B) 0.04 percent or greater C) 0.08 percent or greater

4. (The hard one) You're flying a nonpressurized airplane at 13,500 feet MSL for 45 minutes, carrying one passenger. Under 14 CFR 91.211, what are the supplemental oxygen requirements for this flight?

A) None, since you're below 14,000 feet MSL B) The required flight crew must use oxygen for the 15 minutes spent above 12,500 feet beyond the first 30 minutes; the passenger has no requirement C) Both the flight crew and the passenger must use oxygen for the entire 45 minutes

Tally your answers. The key (and a scoring guide) is at the bottom of the issue.

06: Squawk Box

Here's one for the group chat: the first air traffic controller in America worked with no radio, no radar, and no tower. In 1929, Archie League was hired at St. Louis's Lambert Field, where he set up on the airfield with a wheelbarrow, a beach umbrella, a chair, and a set of flags. A checkered flag meant "go," and a red flag meant "hold." Every clearance you've ever read back started with a guy in a lawn chair.

And the observation: pilots will drive across town to save 40 cents on a gallon of avgas, then spend the savings at the airport restaurant on a burger that somehow costs $19. The $100 hamburger isn't a joke anymore. It's a budget line.

That's the stack for this week. The air is cold, the flying is smooth, and the fuel is expensive enough that every hour in the logbook should feel like it counts. Make the next one count.

Ben

The Flight Nerd Weekly Briefing: density altitude down, fuel prices up, carb heat on.

The Tuesday edition of the Flight Nerd Weekly Briefing is a paid publication by Flight Nerd Air Force. Know a pilot, or someone who wishes they were one, who'd fly further with this in their inbox? Send them our way.

07: Pattern Work Answer Key

Scoring guide:

• 4/4: Flawless. You'd pass a ramp check, an oral exam, and the "well, actually" test at the FBO coffee machine.
• 3/4: Solid. We're guessing the oxygen question got you. It gets everybody. It's basically a hazing ritual.
• 2/4: Right in the pattern. A couple more laps around the books and you're cleared for the option.
• 0-1/4: Go around, re-brief, and try again. Nobody greases every landing, and nobody aces every quiz.

1. Answer: A (Airspeed indicator only). The pitot tube measures ram air pressure, and only the airspeed indicator uses it, comparing that ram pressure to static pressure. The altimeter and vertical speed indicator use static pressure only. This is why a blocked pitot tube (with the drain hole also blocked) makes the airspeed indicator act like an altimeter: it reads higher as you climb and lower as you descend, because only the static side is still changing.

2. Answer: C (Loss of RPM). With a fixed-pitch prop, ice restricting airflow through the carburetor reduces power, which shows up first as a drop in RPM. Engine roughness usually comes later, as the ice builds up. Oil and cylinder head temperatures don't give a reliable early warning. With a constant-speed propeller, the first sign is a drop in manifold pressure instead, because the governor holds the RPM steady.

3. Answer: B (0.04 percent or greater). 91.17 sets the limit at 0.04 percent, half the typical 0.08 standard for driving a car. The same rule also prohibits flying within 8 hours of consuming any alcohol, or while under the influence, or while using any drug that affects your faculties in a way contrary to safety. Legal is also not the same as safe: many pilots use 12 or 24 hours as their personal "bottle to throttle" rule.

4. Answer: B. 91.211 has three tiers. Above 12,500 feet MSL up to and including 14,000 feet MSL, the required minimum flight crew must use supplemental oxygen for any portion of the flight at those altitudes that lasts more than 30 minutes. Above 14,000 feet, the crew must use oxygen the entire time. Above 15,000 feet, every occupant must be provided with oxygen. At 13,500 feet for 45 minutes, you're in the first tier: the first 30 minutes are free, and the last 15 are on the cannula. Your passenger has no requirement, although hypoxia doesn't read the regulations, so offering it is a good call.

If regulation details like 91.211's three-tier structure are what you want to have down cold before test day, the Private Pilot Ground School course covers the full written exam syllabus: flightnerdairforce.com/private-pilot-ground-school-lifetime-access