DA-40 Instrument and Avionics Notes

PFD Alerts, Enunciation, and Takeoff Etiquette

• Alerts in DA-40 avionics: warnings, cautions, and advisories. Advisories are white, cautions are yellow; warnings are time-critical and require immediate attention. Alerts appear in the window, lower-right on the PFD. There is a soft key labeled “enunciation” that can flash advisory warnings; press to view the full alert list when multiple alerts exist.
• Takeoff discipline with alerts:
  • At takeoff, address and shut off alerts; do not proceed with an advisory or caution if a critical condition exists.
  • If a door or canopy warning appears (e.g., door ajar) near the FO/RO position, do not take off; more often than not, a bad sensor is involved, but a door being unlocked is a real issue.
  • If on the roll with time to abort, you may abort; but once off the ground and out of ground effect, judgment must be used to decide whether to continue if warnings appear.
  • Scenario for aborting: multiple warnings such as oil pressure and oil temperature plus engine sounds indicating failure → abort and land as soon as practical.
• Enunciation window and audible/visual cues:
  • Warnings are time-critical; a flashing warning and an oral tone (a chime) occur. An audible tone sequence is described as a single chime every two seconds, continuing until acknowledged via the warning soft key.
  • The alerts window (soft key) lists the active alerts; may flash when new advisories appear.
• Practical caution in traffic patterns:
  • Do not become complacent with ADS-B/TIS alerts; always visually verify traffic outside the cockpit.
  • ADS-B traffic alerts complement visual scanning; do not rely solely on them for collision avoidance.

Marker Beacons and ILS Indicators

• Marker beacon indicators:
  • Outer, middle, inner markers provide three marker signals for ILS approaches.
  • Outer marker indicated by all dashes in Morse code; typically audio Morse beeps (the instructor notes the outer marker is represented by dash-dash-dash-dash in the example). The outer marker indicator is blue on the enunciator and on the PFD/MFD.
  • The middle marker is yellow; the inner marker is white (color coding as described in the notes).
  • Distances: Outer marker is typically around 3 to 6 miles from the runway; middle around 3 to 5 miles from the runway; these markers are associated with ILS approaches and final approach fixes.
• Sound and muting:
  • On some DA-20/DA-40 variants, you can mute marker beacon sounds, but you cannot mute the marker illumination indicator on the PFD; illumination remains to indicate marker crossing.
  • In some models (e.g., DA-20), you can mute the marker sounds; in the DA-40, the illumination remains active during marker beacon overflights.
• Operational notes:
  • If a marker beacon is not audible, you can ask your instructor or mute the audible cue in certain configurations (e.g., DA-20 for silent marker cues).
  • The system will trigger over the outer marker regardless of sound settings; the indicator on the PFD remains active.

Traffic Awareness, TIS-B, and Inset Map

• Traffic information system (TIS) and ADS-B: TIS-B provided traffic information; ADS-B In/Out supported on the DA-40s equipped with Stratus or similar devices and iPad integration.
• How traffic alerts appear:
  • When traffic advisory is detected, the PFD inset map becomes enabled and displays displaced traffic; a single traffic oral alert is generated unless an optional traffic advisory system is installed.
• Cautions on complacency:
  • Even with traffic advisories, pilots should continuously scan for traffic and outside visual cues; ADS-B should supplement, not replace, good lookout practices.

ADS-B, Stratus, and iPad Integration

• Stratus/iPad workflow (DA-20/DA-40):
  • Stratus provides ADS-B In/Out; iPad can pair with Stratus to receive traffic information and weather overlays.
  • For older headsets without Bluetooth, an adapter in the DA-20/DA-40 allows Bluetooth from the headset to the iPad via the Stratus unit, enabling ADS-B traffic in the ear via the iPad.
  • This setup is described as a cost-effective “ADS-B in/out” solution using a headset/iPad pairing.
• Priority adapter on DA-20/DA-40:
  • The back of the adapter has two buttons (and possibly a volume control) to turn the adapter on and to enable Priority mode.
  • Priority mode interrupts the intercom, allowing the instructor or pilot to hear ATC or another party without being interrupted by cockpit chatter.
  • Use: helps prevent miscommunication during busy taxi, takeoff, or critical climb phases by isolating PA/Intercom from the main cockpit audio.
• Practical considerations:
  • If you don’t have Bluetooth on your headset, instructors can demonstrate pairing and use the Priority feature.
  • With Stratus/iPad integration, you can receive GPS-derived traffic and weather overlays directly in your headset, aiding situational awareness.

Terrain Awareness and Inset Map (TAWS/Terrain Awareness)

• TAWS (TOS) and PFD placement:
  • Terrain awareness and warning system (TAWS) appears on the PFD in the upper left of the altimeter area and is discussed in the Hazard Avoidance section.
  • The inset map can display traffic when enabled via the soft key labeled Inset.
• Inset map and hazard avoidance:
  • The inset map can be toggled to display terrain and traffic for hazard avoidance in the flight path, especially during approaches and in terrain-prone areas.

Altitude Alerting, MDA/DH, and WAAS Guidance

• Altitude alerting basics:
  • The system provides visual and aural alerts when approaching the selected altitude; the alert resets when the altitude setting is changed.
  • The alert is independent of the GFC 700 autopilot; altitude alerting is conditional on a GFC being installed.
• Approaching the altitude and timing:
  • As you approach the selected altitude, the display changes color and emits tones; within the approach window, the color and alert behavior change as you get closer.
  • Within $ext{within } ext{approximately } ext{200 ft}$ of the selected altitude, the display changes to blue and the annunciation flashes for about $5 ext{ s}$.
  • After crossing the selected altitude, the system indicates that the remaining deviation is outside $\bigl| ext{delta} \bigr| > 200$ ft, with color changes to light blue, then white, and finally yellow to indicate termination of the approach segment.
• WAAS and vertical guidance:
  • All DA-40 aircraft have WAAS-enabled navigation with vertical guidance; this supports both MDA (minimum descent altitude) and DH (decision height) guidance if applicable.
• MDA/DH and WAAS in the time reference window:
  • MDA (or DH) can be set in the time reference window and is reset if power is cycled.
  • When active, the altitude setting is shown on the lower left of the altimeter with a bug.
• MDA-related annunciations:
  • When descending toward the MDA, the display shows a Baro Minimum signal and the altitude bug; at 2,500 ft of vertical distance from MDA, a Bay Row minimum annunciation appears; at 100 ft AGL above MDA, the bug turns white; at the point of reaching MDA, the bug and text turn yellow and a minimums alert is generated.

Bay Row Minimum Descent Altitude and Approach Adjustments

• Example scenario for RNAV approach amendments during flight:
  • If ATC requests a different approach (e.g., wind shift requires circling instead of straight-in RNAV 2-3), the crew must adjust the minimums accordingly.
  • It is possible to load a different approach and keep the RNAV straight-in minimums if circling minimums are required for a circle approach; higher minimums may be required for circling.
• How to adjust Bay Row minimums:
  • Set Bay Row minimum by selecting Time Reference, highlighting the minimum field, selecting Bay Row, pressing Enter, and using the small FMS knob to set the desired altitude.
  • If the aircraft climbs after reaching MVA, alerting is disabled after the aircraft climbs more than ~50 ft above the MVA (per the notes).
• Practical guidance:
  • In high-workload instrument checks, it’s acceptable to verbally note the new minimums or write them down if time is constrained; the important piece is to maintain situational awareness and comply with the latest ATC instructions.

GPS Integrity, Loss of GPS, and Dead Reckoning (DR)

• Loss-of-GPS integrity indicators:
  • LOI: Loss of integrity of GPS is indicated; the system may switch to dead reckoning to compute navigation data when GPS integrity fails.
• Dead Reckoning (DR):
  • Dead Reckoning uses projected position rather than GPS position to compute navigation data and sequence active flight plan waypoints.
  • When in dead reckoning, the display shows LOI and DR indicators (in yellow) to verify the status.
• Verification in DR mode:
  • Items displayed in yellow should be verified when operating in Dead Reckoning mode; expect possible differences from GPS-based navigation.

Unusual Attitudes and Recovery Procedures

• Unusual attitude indicators:
  • When the aircraft enters an unusual pitch, red extreme pitch warning chevrons point toward the horizon (± up to about $50^ ext{o}$ pitch above and $30^ ext{o}$ below horizon), and the PFD declutters to emphasize essential flight information.
  • In such scenarios, the altimeter, airspeed, altitude, DSI, and HSI indicators remain; enunciations and other non-essential data may be removed to reduce clutter.
• Recovery steps (per Instrument Flying Handbook):
  • Do not attempt to interpret a possibly failed indicator on the six-pack; instead, follow the standard recovery sequence: throttle to idle, level the wings, and then bring the nose up to the horizon with coordinated inputs; instructor commentary notes that the steps are to be followed in order.
  • In DA-40, the PFD can aid recovery; if a system failure exists, the display may show a big X (indicating failure) and the pilot should rely on standard instruments and procedures.
• Practical emphasis: even with modern glass cockpits, apply standard restoration procedures promptly and avoid overreacting to partial data.

Audio Panel, Radios, Intercom, and Auto-Tuning

• Audio panel overview:
  • Left side shows the mic label for transmit; this is where you transmit, and the corresponding radio is selected via the COM keys.
  • Com 1, Com 2, and sometimes Com 3 exist; some DA-40 variants do not have a third radio (DA-40 variants may differ in radio count).
• Transmit/Receive indicators:
  • When you select a transmitter (e.g., Com 1), the corresponding receive indicator lights up (automatic receive) and you can hear on the speakers while transmitting.
  • If you want to monitor ATIS or other frequencies, you can select Comm 2 to monitor while actively talking on Comm 1.
• Ground/ATIS management:
  • You can monitor ground on Com 2 while ATIS is on Com 1; when push-talking, the radio in use becomes the active transmit channel.
• Dispatch and intercom practices:
  • When busy, you may route Tower to one radio and Ground to another; you can monitor one while transmitting on the other.
  • After you complete a contact or clearance, switch the remaining radio to the dispatch frequency for ongoing communications.
• Two-row radio arrangement and intercom:
  • Some DA-40 variants have two radio stacks while others have a single stack; the intercom system is separate from the radios and uses a pilot/copilot split audio.
  • Active vs standby fields: Active is the current tuned frequency; Standby is the one you are tuning to; after tuning, press the “Use/Standby” control to swap active and standby.
• Transmit indicators and controls:
  • TX and RX indicators show when you are transmitting or receiving; when you press the PTT, the TX indicator lights.
  • The PFD may show a small bar or indicator next to the frequency to signify transmit or receive status.
• Playback and backup features:
  • Some panels feature a playback function enabling you to review recent ATC transmissions; use cautiously because replaying too often can annoy ATC and lead to confusion about the current clearance.
• Emergency procedures and intercom priorities:
  • The intercom has an emergency procedure (button labeled Emergency +1 215 in some configurations), but in IFR, it is generally better to communicate with ATC and state your intentions rather than triggering the emergency override unless you are in a true in-flight emergency requiring immediate attention.
• Practical tips for radio work:
  • If you’re not sure of ATC instructions, ask for clarification (e.g., “Say again please?”) instead of replaying the transmission and risking a misinterpretation; a quick clarification minimizes miscommunication and ensures you are following the correct clearance.
  • When handling multiple aircraft and busy frequencies, consider reassigning radios to separate tasks (e.g., Tower on one radio, Ground on another) and use the PFD frequency display to monitor when to switch back.
• Auto-tuning capabilities:
  • Some DA-40 variants offer auto tuning of NAV frequencies from the NAV radios; you can press the COM knob to auto-tune and adjust with the inner knob to select the exact frequency.
  • Auto-tuning can be used to quickly switch between frequencies without manual dialing, which can save time in busy airspace.
• Navigation identification and Morse code:
  • In DA-20 configurations, you must listen to Morse code identifications to positively identify NAV VORs; in later models (DA-40), the three-letter identifier lights up on the navigation frequency and provides positive identification without Morse playback.
• ADF and squelch controls:
  • ADF and manual squelch controls exist on some configurations; you can manually adjust squelch for radio playback and listening to multiple transmissions.
• Communications discipline and practice:
  • Use playback and review sparingly to avoid slowing down clearance or interrupting ATC; practice commands and phrases to ensure clarity when asking for repeats.

Emergency and Practical Flight Guidance during IFR and VFR Operations

• Emergency procedures and ATC coordination:
  • In an IFR emergency (e.g., alternator failure, IMC), request radar vectors to nearest suitable airport and provide your altitude and MVA; ATC can brief an approach and vector you accordingly.
  • Do not switch to emergency +1 215 arbitrarily; instead, maintain contact with ATC and provide clear intentions and planned actions (e.g., “Request radar vectors to nearest suitable airport, altitude 4,000 feet, no gyro, maintain VFR if possible”).
• No-gyro and instrument failure scenarios:
  • If gyro failure occurs, ask for assistance with vectoring and instrument approach as necessary; ATC can provide vectors to the nearest safe landing.
• Traffic and collision avoidance:
  • The equipment should be used to assist collision avoidance, not as a sole method of separation; maintain scanning and visual checks to prevent mid-air incidents.

Notes on Real-World Practice and Ethics

• Do not rely solely on automation for collision avoidance; maintain thorough visual scanning and clear communication with air traffic control and flight instructors.
• In high-workload environments (busy patterns, many aircraft), prioritize altitude and heading management; keep minimums and approach changes in the memory, and verify them in your flight deck before committing to a landing.
• Regularly verify GPS integrity indicators and be prepared to switch to dead reckoning or alternate navigation methods if GPS shows LOI or degraded performance; this includes knowing how to switch back to GPS once integrity is restored.
• Practice scenarios with wind shifts, approach reconfigurations (RNAV to circling minimums), and altitude alert changes to ensure you can adapt quickly and safely.

Quick Reference: Key Terminology and Values

• Alert types and colors: advisories (white), cautions (yellow), warnings (time-critical; visual and audio cues).
• Altitude alerting triggers: within $ext{approx. } \bigl| ext{delta} \bigr| \le 200\ ext{ft}$; blue on the tape; early flashing for $ext{5 s}$; after crossing altitude, changes to other color states (light blue, white, yellow).
• Marker beacon distances: outer marker around $3 ext{ to }6\ ext{mi}$ from runway; middle around $3 ext{ to }5\ ext{mi}$; inner marker typically closer to the runway.
• Bay Row: Bay Row minimum descent altitude selection involves Time Reference, minimum field, Bay Row, and selecting altitude with the FMS knob.
• GPS integrity indicators: LOI (Loss of Integrity) triggers Dead Reckoning mode; verify items in DR mode on the display when LOI shows.
• WAAS: Wide Area Augmentation System, enables vertical guidance in GPS approaches; used for both MDA/DH guidance and precision approach performance.
• ADS-B/Stratus/iPad integration: enables traffic and weather overlays; Bluetooth adapters available for older headsets; Priority mode can mute intercom to prioritize ATC or instructor messages.
• Audio panel controls: COM1/COM2/COM3 (where applicable), mic selection, transmit/receive indicators, standby vs active frequencies, and auto-tune capabilities.
• Unusual attitude recovery: follow standard recovery steps per Instrument Flying Handbook; throttle idle, level wings, lower nose to horizon, then recover to level flight; in glass cockpits, rely on PFD cues but maintain standard procedure.
• Practical avionics setup notes: two-radio configurations can enhance efficiency; monitor dispatch on one radio while leaving Tower/Ground on another when needed; use playback sparingly to avoid miscommunication.

If you want, I can reorganize these notes into a more compact study sheet with explicit queries for self-testing (e.g., multiple-choice or scenario-based questions) or expand any section with more examples from your course materials.