Helicopter IFR Review
VOR Reveiver Checks - Correct Answer ✔️✔️Every 30 calendar days.
VOGDA
V- VOT FAR 91.171 (b) (1)-
VOR Check Site allows you to check accuracy regardless of your position relative
to the VOR - Nearest VOT to KOA would be at HNL - Allowable margin of error = 4°
O- Own FAR 91.171 (b) (4)-
Find a known spot on the sectional chart and fly over it noting the radial it should
be on - Allowable margin of error = 6°
D- Dua l FAR 91.171 (c)-
Compare the indication of 2 receivers that are independent of each other but use
one antenna. - Allowable margin of error = 4°
,G- Ground FAR 91.171 (b) (2)-
A point on an airport published in the A/FD, compare published radial to your
receiver. - Allowable margin of error = 4°
A- Airborne FAR 91.171 (b) (3)-
Check point in the air (victor airway) compare published radial to receiver
indication. - Allowable margin of error = 6°
VOR check signoff - Correct Answer ✔️✔️PEDS
P - Position
E - Error
D - Date
S - Signature
,91.171
Distance Measuring Equipment
(DME) - Correct Answer ✔️✔️962-1213 MHz (UHF).
Normally tuned automatically with a paired VHF station (VOR/LOC).
The Airborne DME unit transmits an interrogation signal.
The ground DME facility receives and replies to the interrogation.
The time passed is used by the airborne unit to calculate the slant range distance
from the aircraft to the station.
Slant range error is negligible at 1 NM from the DME station per every 1000ft.
NDB - Correct Answer ✔️✔️Non-Directional Beacon
, Considered Non-Directional because the NDB radiates identical electro-magnetic
energy in all directions
Low to medium frequency band
ADF (Automatic Direction Finder) in aircraft points towards the NDB station
Magnetic Bearing = Magnetic Heading + Relative Bearing
NDB service volume classes: - Correct Answer ✔️✔️Compass Locator:
15NM
Medium High (MH): 25NM
High (H): 50NM (may be less, as published in a NOTAM or the A/FD)
VOR Reveiver Checks - Correct Answer ✔️✔️Every 30 calendar days.
VOGDA
V- VOT FAR 91.171 (b) (1)-
VOR Check Site allows you to check accuracy regardless of your position relative
to the VOR - Nearest VOT to KOA would be at HNL - Allowable margin of error = 4°
O- Own FAR 91.171 (b) (4)-
Find a known spot on the sectional chart and fly over it noting the radial it should
be on - Allowable margin of error = 6°
D- Dua l FAR 91.171 (c)-
Compare the indication of 2 receivers that are independent of each other but use
one antenna. - Allowable margin of error = 4°
,G- Ground FAR 91.171 (b) (2)-
A point on an airport published in the A/FD, compare published radial to your
receiver. - Allowable margin of error = 4°
A- Airborne FAR 91.171 (b) (3)-
Check point in the air (victor airway) compare published radial to receiver
indication. - Allowable margin of error = 6°
VOR check signoff - Correct Answer ✔️✔️PEDS
P - Position
E - Error
D - Date
S - Signature
,91.171
Distance Measuring Equipment
(DME) - Correct Answer ✔️✔️962-1213 MHz (UHF).
Normally tuned automatically with a paired VHF station (VOR/LOC).
The Airborne DME unit transmits an interrogation signal.
The ground DME facility receives and replies to the interrogation.
The time passed is used by the airborne unit to calculate the slant range distance
from the aircraft to the station.
Slant range error is negligible at 1 NM from the DME station per every 1000ft.
NDB - Correct Answer ✔️✔️Non-Directional Beacon
, Considered Non-Directional because the NDB radiates identical electro-magnetic
energy in all directions
Low to medium frequency band
ADF (Automatic Direction Finder) in aircraft points towards the NDB station
Magnetic Bearing = Magnetic Heading + Relative Bearing
NDB service volume classes: - Correct Answer ✔️✔️Compass Locator:
15NM
Medium High (MH): 25NM
High (H): 50NM (may be less, as published in a NOTAM or the A/FD)
