Refer to the 10-3A GOWEN 4 DEPARTURE for KBOI/BOI (Boise ID) when necessary to answer the following questions:
a True b False
2. Select all that apply. Required obstacle clearance for an ODP is based on ______
a an obstacle assessment area that is limited to 25 nm from airport in mountainous areas.
b the aircraft maintaining a climb gradient of at least 200 ft/nm (or greater if indicated on the chart).
c the aircraft climbing to 500 ft above the departure end of the runway elevation before making an initial turn.
d the aircraft crossing the departure end of the runway at least 35 ft above the departure end elevation.
e a 40:1 obstacle identification surface (OIS) that begins at the departure end of the runway and slopes upward at 152 ft/nm.
3. Select all that apply. Which are obstacles that apply to takeoff?
a A navaid facility is located 415 ft from the departure end of Rwy 10L.
b A tree with a height of 100 ft AGL is located 2048 ft from the departure end of Rwy 28L.
c A navaid facility that extends to 2880 ft MSL is located 5 ft from the departure end of Rwy 10L, 415 ft right of the centerline.
d A building with a height of 15 ft AGL is located along the extended runway centerline 270 ft from the departure end of Rwy 10L.
4. The AGL and MSL height of obstacles within 1 nm of the departure end of a runway that penetrate the 40:1 obstacle clearance surface are listed on the chart under Takeoff Obstacles Notes.
a True b False
5. The procedure is charted to scale.
a True b False
6. Select the true statement(s) regarding obstacle and terrain clearance for this SID.
a The highest charted terrain is 7000 ft MSL.
b The Grid MORAs provide obstacle/terrain clearance of 1000 ft.
c The Grid MORA of 8500 ft MSL applies to aircraft over BOISE VORTAC.
d The MSA of 9500 ft MSL provides obstacle/terrain clearance of 1000 ft within 25 nm of BOI VOR.
7. Select the requirement(s) for performing the visual climb over airport procedure.
a ATC approval.
b A climb gradient over 200 ft/nm.
c A minimum ceiling of 1000 ft AGL and minimum visibility of 1 sm.
d A minimum ceiling of 5500 ft AGL and minimum visibility of 3 sm.
8. Select all that apply. To perform the visual climb over airport procedure, the aircraft must _____
a take off from Rwys 10L/R.
b maintain a climb gradient of at least 205 ft/nm to 4300 ft MSL.
c climb in visual conditions on the assigned route of flight to the applicable MEA.
d climb in visual conditions to cross the airport at or above the MEA or MCA applicable to BOI VOR.
9. Select all that apply. When flying the ODP, taking off from Rwy 10R with a ground speed of 150 kts, standard takeoff minimums apply with a minimum __________ to 4300 ft MSL.
a climb rate of 205 ft/min.
b climb rate of 513 ft/min.
c climb rate of 520 ft/min.
d climb gradient of 205 ft/nm.
e climb gradient of 205 ft/min.
10. Select all that apply. Which is a correct procedure when flying the ODP after taking off from Rwy 10L?
a Cross FIMGU at or above 5300 ft MSL.
b Cross BOI VOR at or above 3600 ft MSL.
c Climb on a heading of 102° to 3600 ft MSL.
d Climb gradient of 205 ft/min. At FIMGU, fly inbound on a course of 036° to BOI VOR.
e Climb gradient of 205 ft/min. After flying a heading of 262°, intercept the 216° radial inbound to BOI VOR.
f Climb gradient of 205 ft/min. After flying a heading of 262°, intercept the 216° radial outbound to FIMGU.
Answers to TC 8/20 questions
1.b The GOWEN 4 Departure is an obstacle departure procedure (ODP), which is indicated by the word OBSTACLE in the procedure title. According to AIM 5-2-9, ODPs are recommended for obstruction clearance and may be flown without an ATC clearance, unless an alternate departure procedure (SID or radar vectors) has been specifically assigned by ATC.
2. b, d, e According to the AIM 5-2-9, required obstacle clearance is based on the aircraft crossing the departure end of the runway (DER) at least 35 ft above the DER elevation, climbing to 400 ft above the DER elevation before making an initial turn, and maintaining a minimum climb gradient of 200 ft/nm, unless required to level off by a crossing restriction, until the minimum IFR altitude. The 40:1 obstacle identification surface (OIS) begins at the DER and slopes upward at 152 ft/nm until reaching the minimum IFR altitude, or entering the enroute structure. This assessment area is limited to 25 nm from the airport in non-mountainous areas, and 46 nm in designated mountainous areas.
3. b, c According to the Takeoff Obstacle Notes for Rwy 10L, a navaid with a height of 16 ft AGL and 2880 ft MSL is located at 5 ft from the DER and a building and general utility, which is 15 ft AGL/2888 ft MSL begins at 270 ft from the DER. The navaid is 415 ft to the right of the centerline and the building is 444 ft to the left. The only obstacle listed for Runway 28L is a tree 2048 ft from the DER, 508 ft left of the runway centerline, at a height of 100 ft AGL/2909 ft MSL.
4. a According the AIM 5-2-9, obstacles that are located within 1 nm of the DER and penetrate the 40:1 OCS are referred to as “low, close-in obstacles.” The standard required obstacle clearance (ROC) of 48 ft/nm to clear these obstacles would require a climb gradient greater than 200 ft/nm for a very short distance. To eliminate publishing an excessive climb gradient, the obstacle AGL/MSL height and location relative to the DER are noted so obstacles can be avoided.
5. a Charting scales allow a to-scale depiction of the immediate area around the departure airport. The charting scale is indicated along the lower left side of the chart. Normally, all departure/arrival tracks will be shown within the to-scale portion of the procedure graphic. At times, transitions to and from the enroute structure will be shown within not-to-scale areas, which are indicated by a dashed line and clearly marked.
6. a, d The Highest Arrow indicates the highest charted terrain point/obstacle, which is the terrain northeast of the airport. The Contour Intervals key in the lower left of the plan view shows that the depicted terrain is 7000 ft MSL. Grid MORAs (based on grids formed by 30 minutes or 1 degree of latitude/longitude) are shown as thousands figures plus the first hundred figure in a smaller character, and are only charted for the to-scale portion of the chart. All MORA altitudes that are 5000 ft or lower have an obstacle clearance of 1000 ft. MORA altitudes that are 5001 ft or greater have an obstacle clearance of 2000 ft. Minimum safe/sector altitudes (MSAs) are depicted in brown (9500) with the MSA center identified (BOI VOR). The MSA diameter is depicted if it differs from 25 nm.
7. a, d A visual climb over airport (VCOA) procedure is a departure option for an IFR aircraft operating in visual meteorological conditions (VMC) equal to or greater than the specified ceiling and visibility – in this case, 5500 ft AGL and 3 sm, as indicated in the takeoff minimums section. The VCOA procedure allows the pilot to visually conduct climbing turns over the airport to the published “climb-to” altitude from which to proceed with the instrument portion of the departure. VCOA procedures are developed to avoid obstacles greater than 3 sm from the DER as an alternative to complying with climb gradients greater than 200 ft/nm. The VCOA instructions indicate that ATC approval must be obtained when requesting an IFR clearance.
8. a, d VCOA instructions are only listed for takeoff from Rwys 10L/R. These instructions and notes on the plan view indicate that a climb in visual conditions to cross Boise Air Terminal/Gowen Airport at or above the BOI VOR MEA/MCA is required before proceeding on the assigned route of flight.
9. b, d The takeoff minimums section of the chart indicates that, for Rwy 10R, standard minimums (or lower than standard, if authorized) apply with a minimum climb gradient of 205 ft/nm. The table indicates that a climb gradient of 205 ft/nm requires a climb rate of 513 ft per minute (ft/min) at a ground speed of 150 kts.
10. a, c, d, f According to the Initial Climb instructions and the plan view, after taking off from Rwy 10L, climb on a heading of 102° to 3600 ft MSL before turning right to a heading of 262°. The line below 3600 on the plan view indicates a minimum altitude. The routing instructions state to intercept the 216° radial outbound to FIMGU, which is 11.0 nm from BOI VOR. A minimum altitude of 5300 is required when crossing FIMGU. At FIMGU, the aircraft must turn and intercept the 216° radial (036° course) inbound to the BOI VOR and continue to climb to cross BOI at or above the MEA or MCA for the assigned route of flight.