Stage 48 Oral Flashcards
What are 6 airborne Navigation Instruments we use?
- HSI
- RMI
- ADF
- VOR
- GPS
- CDI
How would you describe control/performance, and what are the 4 steps?
- Setting attitude and power to achieve a desired performance
1. Establish
2. Trim
3. Cross-check
4. Adjust
What are the 3 common errors that occur during instrument cross-check/scan?
- Fixation
- Omission
- Emphasis
What are the 3 segments of the GPS system?
- Space (Satellites)
- Control (Ground Station)
- User (Aircraft)
How many satellites are required for triangulation, and what information will that provide?
- Need a minimum of 3 satellites
- Will provide Lat/Long coordinate only (no altitude)
What is RAIM? How many satellites does is need to function?
- Receiver Autonomous Integrity Monitoring
- An internal check (not augmentation) for bad satellite signals that will kick them out/replace with good ones
1. 5 Satellites to DETECT a bad signal
2. 6 Satellites to KICK IT OUT
What is WAAS? What does it augment, and how? (Draw a Picture)
- Wide Area Augmentation System
- Corrects GPS positioning signal errors
1. WAAS Satellites send signals to surveyed positions on the ground with known, unchanging coordinates
2. Satellite signal indications are compared with the real ground station coordinates
3. Any identified errors are signaled to a Mother-Ground Station
4. Mother-Ground Station signals a Broad-casting satellite of the error
5. Broadcasting Satellite sends out the correction to the a/c
If we lose WAAS, how does that limit us?
- Information will not be as accurate
- En-Route CDI deflection will increase to 5nm either side
- Airport you’re going to must have another type of approach available
How many satellites must be visible in order to have WAAS?
6 Satellites
Describe some aspects of the ADF. What navigation system does it rely on? What limits/errors is it subject to?
- Automatic Direction Finder (airborne)
1. Relies on NDB ground stations (HH, H, MH) - Limited to NDB SSVs and errors
2. No indication if signal is lost, must listen to Morse Code ID constantly
3. Transmits on a lower frequency, subject to more interference
4. Loop antenna and a Sense antenna determine a/c’s Relative Bearing
What is a good rule of thumb for knowing when to start you turn to establish yourself on a DME arc?
- 1% of you GS
ex: 100 knots…start your turn when you are 1nm our from the arc - UND: 0.5nm away
What 3 components are associated with the Localizer system? What equipment makes them up?
- Guidance (Localizer Antenna and Glideslope)
- Range (Marker Beacons (OM, MM, IM) picked up by DME)
- Visual (Approach, touchdown and centerline lights)
What is the SSV of a Localizer? What frequencies does it radiate?
- 35 degrees for 10nm, 10 degrees fo 18nm
- Localizer Beam: 3-6 degrees (varies), 700ft wide at Threshold (Localizer antenna always placed to achieve this)
- Right “blue” = 150 Hertz, Left “yellow” = 90 Hertz, where they intersect = centerline
What information does the Localizer Antenna provide? Where is it located and why?
- Course deviation to the Left and Right of centerline
- Full scale deflection shows 2.5 degrees on either side
- Positioned at the end of the runway to provide 3-6 degrees (varies) path and be 700ft wide at Threshold
What are some common errors when using a Localizer?
- Reflection - objects below 5,000’ AGL disrupting signal
- False Course - Glideslope
- Needle deflection when passing over - HOLD YOUR HEADING!
What is the SSV of a Glideslope? What guidance/information does it provide?
- Service Volume is 10 NM
- Based off a normal 3° glide path so that it intersects the MM at 200 feet and the OM at 1400 feet
- Course Deviation Up and Down of centerline
- Full Scale deflection shows 0.7 degrees on either side
If the ADC fails, what instruments will we lose?
- ASI
- VSI
- Altimeter
If AHRS fails, what instruments will we lose?
- Attitude Indicator
2. Heading Indicator
AS SOON AS YOU LOSE 1+ INSTRUMENTS, WHAT DO YOU DO?
RUN THE CHECKLIST
THEN: NOTIFY ATC
1. What you’ve lost
2. Whether you can continue operating IFR off the standbys
3. Whether you are in need of assistance now or in the future
- ASK FOR VECTORS
What is Equivalent airspeed?
- Calibrated AS corrected for compression error
What information does an HSI provide? What is one main component of its operation?
- Gives heading, course selector, glide slope and TO/FR indication (combines heading indicator with CDI)
- Improves situational awareness - When slaved to a Magnetic Flux Gate, it automatically updates with a/c rotation (adjusts to magnetic currents)
What is the purpose of a flux gate/valve?
- Enables compass to readily accept lines of magnetic from the Earth’s field and still indicate correct magnetic heading
(peace sign)
What gyroscopic instruments operate on Rigidity?
- Attitude Indicator
2. Heading Indicator
What gyroscopic instruments operate on Precession?
- Turn Coordinator
2. Turn-Slip Indicator
What is deviation with a magnetic compass?
- The errors in magnetic indication due to instruments/equpment that could not be eliminated when the a/c was aligned on a compass rose
Define Variation
The difference between True North and Magnetic North
What information does the Turn Coordinator provide? How does it know what the airplane is doing?
- Aircraft YAW (turn rate/heading) and ROLL (attitude)
- GYRO is mounted HORIZONTAL and PARALLEL to LATERAL axis allowing it to “feel” precession from a/c YAWING around it
- Gyro. GIMBAL is canted 30 degrees up from the LONGITUDINAL axis of the a/c, allowing gyro to “feel” precession from a/c ROLLING around it
What information does the Turn-Slip Indicator provide? How does it know what the airplane is doing?
- Aircraft YAW (turn rate/heading) only
- GYRO is mounted HORIZONTAL and PARALLEL to LATERAL axis, allowing it to “feel” precession from the a/c YAWING around it
What airborne equipment can we uses with NDBs?
- RMI
- ADF
What are the NDB ground stations? What are their SSVs?
- HH (high homing) - 75nm
- H (homing) - 50nm
- MH (medium homing) - 25nm
- Compass Locator - 15nm
What is Relative Bearing? What is the formula for it?
- The angular difference between a/c heading and the location of the station, measures CLOCKWISE from the nose of the a/c
- Relative Bearing + Magnetic Heading = Magnetic Bearing
What are the 5 errors that NDBs are susceptible to?
- Thunderstorm Effect: ADF needle is deflected toward a nearby electrical storm
- Night (Twilight) Effect: NDB signals can be refracted by the ionosphere and then return to Earth, causing interference with the normal NDB surface waves, resulting in a fading signal/wandering ADF needle.
- Interference: Other NDBs transmitting on similar frequencies (especially at night).
- Mountain Effect: Reflections of the NDB signals from mountains.
- Coastal Effect: NDB signal bending toward the coastline when crossing it at an angle.
If the ADF fails, what indication will there be?
There will be no indication of a failure, that’s why you must listen to the Morse Code ID the whole time you are using it
How does a VOR ground station identify a/c location?
- Transmits 2 VHF radio signals:
1. Reference phase signal (omni-directional, determines TO/FR indication)
2. Variable phase signal (rotates uniformly at a rate of 1800 rpm, with its phase varying at a constant rate throughout the 360°)
What major error is VOR subject to?
- LINE OF SIGHT
Ex: Terrain/obstruction blocking a/c recieval of VOR signals, or location of the station
What are the 3 types of VORs and there SSVs?
- Terminal (1-12’ - 25nm)
- Low (1-18’ - 40nm)
- High (4 Tiers)
How does a DME measure distance between the station and a/c?
- The TIME delay between a/c interrogator signals being sent out, and the ground beacon transponder reply pulse being received back
What is the purpose of having SSVs?
- To know the MINIMUM ranges in which you are GUARANTEED reception
- To plan routes always within a SSV of a navaid
What are the regulatory FAA requirements for VOR checks?
- 91.171 requires the VOR receiver to be checked every 30 days if it is to be used for IFR operations
What are the 3 ways to check a VOR and their respective tolerances? Where can you find information on check facilities?
- Information can be found in AFD/Pacific Chart Supplement
1. VOT/Ground Checks: +/- 4°
2. Dual VOR Checks: +/- 4 °
3. Airborne Checks: +/- 6 °
What makes up IFR required equipment for flight?
Generator Radio (2-way) Attitude Indicator Ball (slip-skid Indicator) Clock (Installed - can count SECONDS) Altitude Indicator Rate of Turn Indicator Directional Gyro.
What is the VOR symbol? What does services does it provide?
- Hexagon with a dot
- Just VOR navigation
What is the VORTAC symbol? What services does it provide?
- Hexagon with dot and 3 black trapezoids on the sides (like TACs)
- Consists of 2 components: VOR and TACAN
- Provides VOR, azimuth, and DME navigation
What is the VOR/DME symbol? What does services does it provide?
- Hexagon with a dot in a square
- Provides VOR and DME navigation
What navigation instrument will never be affected by reverse sense?
The HSI! And the flag will always point towards the station.
Where are Magnetic Flux Gates usually located?
- On the wingtip of an a/c (away from equipment to avoid interference)
How does the altimeter work?
- Standard temp and pressure is sealed within the aneroid barometer
- As non-standard temp and pressure change in the atmosphere, the barometer will compress/expand in response
- The barometer’s compression/expansion is transmitted through mechanical linkage to rotate instrument pointers
What happens to TAS with changing altitude? Why?
- TAS increases with increasing altitude
- TAS decreases with decreasing altitude
- As altitude increases, air becomes less dense and therefore Pitot Pressure readings will decrease at a greater rate than the atmospheric presser outside, and vice versa
How does the VSI detect climbs and descents?
- Diaphragm measures change in atmospheric pressure (from static line) for “trend” information
- Calibrated leak in the back of the casing indicates “rate” information depending on the amount of air entering/exiting
Describe Slant Range and the error it can present
- Measure of distance between an airborne a/c and the station on the ground
- Increases with proximity to the station, especially at higher altitudes
How many satellites are in orbit?
- 30 Satellites
- Goal is to have at least 6 visible satellites no matter where you are on the Earth
What 2 errors is DME subject to?
- Slant Range
2. Line of Sight
What is the SSV of a DME?
199 NM or 99 a/c
How would you perform a VOR check using a VOT/ground station?
- Align a/c on designated spot
- Tune to VOT
- VOR should read either 360 FR or 180 TO
- Measure deflecti
If an a/c is sitting on the ground with a pressure of 29.98 “Hg and the pressure level decreases to 29.68 “Hg how will the altimeter be affected?
- The altimeter would show an INCREASE of approximately 300 feet in altitude
How does the ASI work?
- Measures the difference between Pitot pressure and Static pressure
Where is the Outer Marker on an ILS approach located? What does it provide?
- Located 4-7 NM from the end of runway where, glideslope intersects the procedure turn altitude (min. holding)
- Provides a final approach fix for non-precision approaches
Where is the Middle Marker on an ILS approach located?
~3,500’ from the Threshold
What is the power output and the SSV of the Marker Beacons on an ILS approach?
- Have a rated power output of 3 watts or less
- Antenna array is designed to produce a elliptical pattern with dimensions at 1000’ AGL of 2400 ft in width and length
Visual components of ILS?
Visual Information – see AIM for information
How do you properly tune and identify an NDB?
- Monitor the Morse code ident continuously during use
2. If you hear an incorrect or test ident, the NDB must not be used for navigation.
What are some advantages of using a DME?
Provides:
- Distance in nautical miles
- Groundspeed in knots (only reliable going directly to or from the station)
- Time to station in minutes (only reliable going directly to the station)
- Accuracy: ½ mile or 3% of distance; whichever is greater - Can substitute for an OM on an approach
Why do we turn the Master (ALT only) switch off when we get a Low Volts Annunciatior?
- In case the alternator has gone offline due to an overvoltage (protection mechanism)
- Cycling the ALT master switch can restore power (reset when turned back on)
- Switch power source to the Essential BUS (Standby Battery)
With an inadvertent icing encounter, why do we turn cabin HT and defrosters on?
- To prevent icing of the windshield
With flight into icing conditions, what signs should you be vigilant in looking for?
- A loss of RPM: This can be a sign of air filter (intake) icing
If you suspect your air filter (intake) has been iced over, what should you do?
- Adjust throttle and mixture to hold steady RPM (Expect 10% drop in performance when automatic alternate air door opens inside the cowling)
- Land as soon as practical
How does the Flux Gate work?
Readily accepts and MEASURES Earth’s lines of magnetic flux to determine correct heading
When do you use the ANDS mnemonic?
- When accelerating/deccelerating on E/W headings
When do you use the UNOS mnemonic?
- When turn to Northerly or Southerly headings
What does AHRS use to sense attitude and heading?
Accelerometers and Magnometers
What instrument uses a gyro in our planes? How is it powered?
Standby attitude indicator, vacuum!
What 6-pack gyroscopic instruments are powered electrically?
Turn coordinator and turn-slip indicator
What 4 requirements are there for flying IFR with GPS as the main NAVAID?
- Any Non-WAAS GPS must be equipped with RAIM
- WAAS GPS must meet standards
- MUST CHECK NOTAMs prior to IFR flight
- Must have an approved ALTERNATE means of navigation appropriate to flight
What are the 3 different CDI sensitivities with WAAS/Non-WAAS GPS navigation? When do they automatically activate?
- En-Route (30nm+ from destination) WAAS = 2nm full scale deflection either side
En-Route Non-WAAS = 5nm full scare deflection - Terminal (~30nm TO/FR) = 1nm full scale deflection either side
- Approach (Past Final Approach WP) = 0.3nm full scale deflection either side
How do Satellites determine a/c location?
Line of Position!
- Signals from several satellites intersect at the a/c and then are able to triangulate location
What is RAIM? How many satellites does it need?
- RECEIVER Autonomous Integrity Monitoring
2. 5 to detect a bad signal, 6 to kick it out and replace it
What makes up the major Control Segments of GPS?
- Monitors and Adjusts satellite performance
- 6 Monitoring Stations across the world (Master control sation in Colo. Springs)
- 4 Ground Antennas across the world
What are the advantages of GPS navigation?
- Cheap
- Available 24/7
- Unlimited # of users
- Extremely Accurate
What are the requirements for the Airborne Segment of GPS?
- Must be INSTALLED in a/c
- Must meet IFR operation standards (RAIM or WAAS equipped)
How does GPS function to locate a/c?
- Transmits codes on 2 frequencies (Status Message and Pseudo Random Code)
- Receiver measures Travel Time and satellite position to determine Altitude
- Triangulation determines lat/long
What are 3 errors of GPS?
- LINE OF SIGHT
- Space Weather (solar interference)
- Terrestrial interference/Jamming/Spoofing
What are some benefits of WAAS?
- Generates electronic glide path independent of ground equipment/barometric aiding
- Manual RAIM calculation not required
- Eliminate cold temperature affect
- Don’t need to install ground station (cheap)
What is the main difference between GPS and GBAS?
- Ground Based Augmentation System reference facility is on/near the airport being served
- Allows precise approaches to multiple runways w/ 1 station
What are the 4 components of LAAS?
- LAAS Ground Facility
- Reference Receiver
- VHF Transmitter
- GPS Satellites
- A/c equipment
When ADS-B is mandated, where will ADS-B OUT be required?
- Class A, B, C
- Class E above 10,000’
What is PBN and what are the 2 types?
- Performance Based Navigation
1. RNAV (Area Navigation)
2. RNP (Required Navigation Performance)