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CE550 flight crew misinterprets SILOW1 departure; intending to maintain 1550 feet until 4NM east of pxr. Departure instructs immediate climb to 7000 feet for low altitude alert.
| Attributes | |
| ACN | 811907 |
| Time | |
| Date | 200811 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : phx.airport |
| State Reference | AZ |
| Altitude | msl single value : 1550 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : p50.tracon |
| Operator | general aviation : corporate |
| Make Model Name | Citation II S2/Bravo |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other |
| Flight Phase | climbout : initial climbout : takeoff |
| Route In Use | departure sid : silow 1 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 43 flight time total : 16066 flight time type : 1000 |
| ASRS Report | 811907 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : departure |
| Events | |
| Anomaly | altitude deviation : undershoot non adherence : clearance non adherence : published procedure |
| Independent Detector | aircraft equipment : altitude alert other controllera |
| Resolutory Action | controller : issued alert flight crew : returned to assigned altitude flight crew : returned to original clearance |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Chart Or Publication |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Approximately 30 mins prior to departure; I picked up ATIS and clearance to ZZZ. The clearance was: 'cleared to ZZZ; silow one departure; bce transition; squawk...' I took the departure procedures out of the aircraft and went into the FBO where the first officer and I both reviewed the departure (silow one). After reviewing the departure we both incorrectly agreed we needed to maintain 1550 ft MSL until 4 DME east of pxr VOR. After departing runway 7R and establishing radar contact; departure control instructed us to 'climb immediately to 7000 ft -- terrain alert.' I believe the wording for the departure (silow one) could be more clearly worded to prevent an incorrect understanding. For example: fly runway heading; climb to 7000 ft; at 1550 ft; turn left heading 070 degrees; at 4 DME east of pxr; turn left heading 045 degrees.
Original NASA ASRS Text
Title: CE550 FLT CREW MISINTERPRETS SILOW1 DEPARTURE; INTENDING TO MAINTAIN 1550 FEET UNTIL 4NM EAST OF PXR. DEPARTURE INSTRUCTS IMMEDIATE CLIMB TO 7000 FEET FOR LOW ALTITUDE ALERT.
Narrative: APPROX 30 MINS PRIOR TO DEP; I PICKED UP ATIS AND CLRNC TO ZZZ. THE CLRNC WAS: 'CLRED TO ZZZ; SILOW ONE DEP; BCE TRANSITION; SQUAWK...' I TOOK THE DEP PROCS OUT OF THE ACFT AND WENT INTO THE FBO WHERE THE FO AND I BOTH REVIEWED THE DEP (SILOW ONE). AFTER REVIEWING THE DEP WE BOTH INCORRECTLY AGREED WE NEEDED TO MAINTAIN 1550 FT MSL UNTIL 4 DME E OF PXR VOR. AFTER DEPARTING RWY 7R AND ESTABLISHING RADAR CONTACT; DEP CTL INSTRUCTED US TO 'CLB IMMEDIATELY TO 7000 FT -- TERRAIN ALERT.' I BELIEVE THE WORDING FOR THE DEP (SILOW ONE) COULD BE MORE CLRLY WORDED TO PREVENT AN INCORRECT UNDERSTANDING. FOR EXAMPLE: FLY RWY HDG; CLB TO 7000 FT; AT 1550 FT; TURN L HDG 070 DEGS; AT 4 DME E OF PXR; TURN L HDG 045 DEGS.
Data retrieved from NASA's ASRS site as of May 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.