Advanced Avionics and Attitude Instrument Flying – Comprehensive Notes

Overview and context

• Instructor introduces topics before diving in: emphasis on advanced avionics, attitude instrument flying, and transitioning to electronically augmented cockpits.
• Demonstrates a VOR receiver from the simulator: it has no glide slope, so only VOR (no ILS) but can do a localizer approach.
• Practical use case: after stage one instrument rating, pilot becomes eligible to apply for commercial; for VFR operations, the equipment can help with crosswind assessment and runway selection based on winds.
• Example: given ATC winds, you might choose Runway 2/32 instead of 23; you can move the runway representation on the display to compare wind direction to your nose, to estimate crosswind component.
• Crosswind concept introduced: if wind is from the west at 20 knots and you take off on Runway 36, crosswind is 20 knots (90° crosswind). If wind direction is between, crosswind is reduced proportionally (roughly 45–50% of the wind at 45°).
• Transition to topic: Advanced Avionics Handbook, with emphasis on transitioning to electronic flight decks while retaining fundamental skills from the basic six-pack.

Fundamentals of attitude instrument flying (three fundamentals)

• Three fundamentals (attitude instrument flying):
  • Instrument cross-check (scanning)
  • Instrument interpretation (understanding primary and supporting concepts)
  • Instrument control (managing control inputs based on interpretation)
• Basic six-pack (required instruments):
  • Attitude indicator (AI)
  • Heading indicator (HI)
  • Altimeter
  • Airspeed indicator (ASI)
  • Vertical speed indicator (VSI)
  • Turn coordinator
• Note about BSI: Backup/standby instrument is not part of the six-pack list; BSI is not considered one of the primary six-pack instruments here.
• Primary pitch instrument in straight-and-level flight: Altimeter (to maintain assigned altitude e.g., 6,000 ft).
• Primary bank instrument in straight-and-level flight: Heading indicator (or DG).
• Attitude indicator as primary only during transitions (e.g., from straight level to climb, level to turn, or turn to level): once transition is complete, a different instrument becomes primary.
• Instrument omission (omission or fixation): skipping a specified instrument or scan can lead to fixation, especially under IMC with ATC instructions.
• Partial panel flying: occurs when some instruments fail; common scenario is attitude indicator failing or unreliable; other instruments remain (e.g., altimeter, ASI) but you may have limited data.
• Attitude indicator failure example: nose-up or nose-down movement vs actual attitude; driver for maintaining scan and relying on remaining instruments.
• Practical note: when ATC assigns a level-off or heading, you may still need to reference which instrument is primary for pitch or bank depending on phase of flight.

Transition, scanning, and the pilot mindset

• Transition logic: during transitions, rely on the attitude indicator as the primary instrument; once stabilized, rely on other instruments (altimeter for pitch, heading/DG for bank).
• Fixation risk: if you drill into one instrument (e.g., altimeter) for too long during IMC, you risk instrument omission and misperception.
• Real-world example: a pilot using ATC guidance while maintaining a climb/level using altimeter and VSI, while crosschecking the attitude indicator and heading indicator.
• Anecdotes: partial panel and correction strategies discussed; emphasis on maintaining situational awareness and not over-relying on a single instrument.
• Emergency/departure scenario: example given of declaring intentions and coordinating with ATC to climb to a safe altitude (e.g., asking for 5,000 ft to get on top) when weather or minima are limiting.
• Maintenance and safety principle: after a discrepancy in flight, the airplane is typically serviced after landing; safety considerations may dictate returning to base to fix issues.
• Real-world incident example: a King Air with landing gear indication issues circled to assess, then diverted back to base; illustrates the importance of prioritizing safety and planning ahead if in IMC.

Turn coordination and synthetic vision

• Turn coordinator basics: standard-rate turn is achieved at a bank angle dependent on airspeed; a standard rate is typically 360° in 2 minutes.
• Rule of thumb for bank angle in turns: $ext{Bank angle} \, \approx \, 0.1 \times V + 5^{\circ}$(V = indicated airspeed in knots)." The steeper the bank, the faster the turn for a given airspeed.
• Synthetic vision context: modern PFDs/MFDs offer synthetic vision and trend indicators; pilots will see two example airplanes on the display and trend information to anticipate attitude and performance.
• Trend indicators: used in PFD/MFD to anticipate future states; helps with automation awareness and manual flying decisions.

Advanced avionics handbook: advantages, disadvantages, and learning challenges

• Advantages of new GA cockpit technology:
  • More information, automation, and options.
  • Better awareness of aircraft position, route, engine health, and performance.
  • Improved weather, traffic, and terrain awareness, especially in instrument conditions.
  • On analog instruments, numeric precision for engine data (oil pressure, oil temperature, exhaust gas temp, cylinder head temp) is limited; advanced systems provide clearer data.
• Technologies available: VOR, RNAV, localizer approaches, NDB approaches (less common).
• NDB approaches: historically used but less common now; there are NDB approaches, but in ACS appendices, NDB is not listed as part of non-precision approaches; ADF is still needed in the airplane; NDB use is not typically required for checkrides under current ACS.
• Key point: multiple ways to reach a destination (direct routes) exist through GPS, PFD/MFD, and flight plans; there are multiple ways to navigate to a waypoint.
• Three learning challenges of advanced avionics:
  1) How to operate the systems.
  2) Which ones to use and when to use them.
  3) How advanced systems affect the pilot and the way they fly (automation dependency).
• Automation dependency discussion (concepts):
  • It’s important to “aviate, navigate, communicate,” but automation should not replace pilot skill; avoid button-pushing for its own sake.
  • Autopilot can mask deficiencies; use automation to enhance awareness, but maintain manual flying skills and situational awareness.
  • Scenario example: during final approach, ATC may request a change; instead of over-relying on FMS, pilots should consider turning and manually guiding the aircraft when appropriate, or quickly transitioning to heading mode and altitude as needed.
• Avionics philosophy: avoid “magenta movie” behavior on approaches (FT lines): do not cross the final approach fix in magenta (a magenta path may indicate RNAV guidance overlay) when performing a VOR approach—cross the FAF with green needles if it is a VOR approach; RNAV overlay can substitute parts of the approach, but the final approach fix should be where the VOR approach requires green needles.
• Practical piloting advice: when testing or in a checkride, have a conservative approach to automation to reduce risk; prefer to fly with green needles for VOR approaches, and reserve magenta overlays for RNAV overlays as appropriate.

Technically Advanced Aircraft (TAA): definition and regulatory requirements

• A technically advanced aircraft must have the following core components:
  • PFD (Primary Flight Display): includes airspeed, attitude indicator, heading, altimeter or related attitude data, and other essential flight information.
  • MFD (Multi-Function Display): provides navigation, systems, and other data.
  • Two-axis autopilot: integrated with the navigation and heading guidance system.
• Two-axis autopilot is the minimum required for TAA; three-axis autopilots exist but are not mandatory for TAA certification.
• The FAA updated commercial requirements: ten hours of complex time in the commercial program (or ten hours of TAA time, or ten hours of turbojet) or a combination totaling ten hours; this can be logged as complex, TAA, or turbojet time, depending on the aircraft and training.
• Clarification on time logs:
  • If you fly a technically advanced aircraft (e.g., Cessna 465 or similar) during instrument training, you can log TAA time in your instrument logbook, but you still must complete the ten hours of TAA training for the commercial certification.
  • Previous rule of ten hours of complex time for commercial remains a reference, but the modern requirement allows flexibility with TAA and turbojet time as alternatives.
• The commercial vs instrument syllabus alignment: whatever is specified for the instrument course or syllabus governs what you must complete for commercial training; types of aircraft (TAA, complex, turbojet) can be mixed to reach the required ten hours of TAA training.

NDB/NAV and approach types for TA avionics

• NDB approaches in the context of advanced avionics:
  • Some NDB approaches exist, but they are increasingly rare and not emphasized for checkrides.
  • ACS appendices show non-precision approaches but NDBs are not listed; ADF is still required in the airplane to use NDB methods when applicable.
• VOR, RNAV (GPS-based), and localizer approaches are readily supported in TA cockpits; several approaches can be executed using integrated FMS/GPS, PFD, and MFD, with direct-routing capabilities.
• Understanding the difference between magenta (RNAV overlay) and green needles (VOR approach navigation):
  • Green needles indicate official navigation guidance for VOR approaches (e.g., cross FAF). Magenta lines are often RNAV overlays or planned direct routes; use the correct guidance mode for the approach being flown.

Practical examples and anecdotes (industry context)

• Two anecdotes emphasize safety and decision-making:
  • A scenario where a flight with maintenance issues chooses to go home for service after landing rather than continuing in unsafe conditions.
  • An incident with a King Air where a landing gear discrepancy led to circling and a decision to divert for repairs—illustrating prudent decision-making under pressure.
• These anecdotes illustrate the importance of maintaining a strong airmanship mindset, even with automation and advanced avionics, and highlight the need to balance automation with good piloting practices.

Update cadence, quizzes, and study reminders

• Quiz reminders: a quiz on attitude instrument flying (chapter 1) is scheduled; content is aligned with the Advanced Avionics Handbook.
• Assigned readings: focus on attitude instrument flying, the advantages/disadvantages of automation in the advanced avionics handbook, and the automation-dependency module when available.
• database updates: GPS databases (e.g., G1000) require regular updates; the typical update cadence cited is every 28 days; ensure database currency for IFR navigation.
• Next steps: begin the Automation Dependency module; review the concept of aviate, navigate, communicate; consider hands-on practice with PFD/MFD, synthesis of raw data into actionable flight information, and the importance of maintaining manual piloting skills.

Key formulas and technical notes (with LaTeX)

• Standard-rate turn (360° in 2 minutes):
  360^rac{\circ}{\text{turn}} = 2\ \text{min} \quad \Rightarrow\quad \text{turn rate} = \frac{360^\B0}{2\ \text{min}} = 180^B0/\text{min} = 3^B0/\text{s}.
• Bank angle rule of thumb for standard-rate turns:
  $\text{Bank angle} \approx 0.1 \times V + 5^\circ,$
  where $V$ is indicated airspeed in knots.
• Crosswind component (geometric approximation):
  $V<em>{\text{cross}} = V</em>w \sin(\Delta \theta),$
  where $V<em>w$ is wind speed and $\Delta \theta$ is the angle between the wind direction and the aircraft’s flight path. For a 90° angle (wind perpendicular to track), $V</em>{\text{cross}} = V<em>w.$ If the wind is 45° off the track, V{\text{cross}} = Vw \sin(45^0) \approx 0.707 Vw.
• Two-axis autopilot requirement (conceptual): autopilot that can control the aircraft along two axes (pitch and heading) and is integrated with the navigation/heading guidance system for compliant TA operation.

Quick study tips (based on instructor emphasis)

• Maintain a robust scan: instrument cross-check, interpretation, and control to avoid fixation on any single instrument.
• Practice transitions: recognize when the attitude indicator should be primary during transitions, then shift reliance to other instruments once stabilized.
• Leverage automation wisely: use autopilot to assist, but stay proficient at manual flying and situational awareness; avoid dependency that erodes core piloting skills.
• Know the regulatory framework: understand the TAA criteria (PFD, MFD, two-axis autopilot) and the ten-hour TAA/complex/turbojet alternatives for commercial training.
• Familiarize with approach types and needle cues: for VOR approaches, aim to cross FAF with green needles; RNAV overlays may use magenta, but ensure proper alignment with the underlying approach type.
• Stay current with avionics updates: GPS databases should be updated on schedule (e.g., every 28 days) to ensure accuracy and compliance during IFR operations.