NTSB Identification: SEA86MA018.
The docket is stored on NTSB microfiche number 30678.
Nonscheduled 14 CFR
Accident occurred Tuesday, October 22, 1985 in JUNEAU, AK
Aircraft: GATES LEARJET 24D, registration: N456JA
Injuries: 4 Fatal.

NTSB investigators traveled in support of this investigation and used data obtained from various sources to prepare this aircraft accident report.

DRG ARRIVAL TO PICK UP A MED-EVAC PATIENT, THE FLT WAS CLRD FOR AN LDA-1 RWY 8 APCH VIA THE ASORT TRANSITION. THUS, THE PLT SHOULD HAVE CONTD SE ON J-541 TWD THE SSR VORTAC & INTERCEPTED THE LOCALIZER (LOC) AT ASORT; THEN TRACK INBND ON THELOC (062 DEG), USING I-JDL FREQ 109.9 MHZ (FREQ FOR LOC & CO-LOCATED DME). AFTER ASORT, MIN ALT WAS 6500' TO DIBOL INTX,5100' TO LYNNS INTXN & 3400' TO THE FAF AT BARLO INTXN. DME FM I-JDL TO THE INTXNS WAS: 18.2, 13.5 & 8 MI. DME FM SSR (SOUTH OF LOC TRACK) TO THE INTXNS WAS 11.2, 12.7 & APRX 16 MI. FLT RPRTD ASORT INBND WHILE DSCNDG THRU APRX 9500'. LASTRDO CALL WAS 30 SEC LATER WHILE DSCNDG THRU 8200', 14 MI WEST OF DIBOL. APRX 4 MI WEST OF DIBOL, ACFT IMPACTED MTN SIDE AT 3500' MSL. NO PREIMPACT MECH MALFUNCTION WAS FND. THERE WAS EVIDENCE THAT BOTH NAV'S WERE TUNED TO 109.9 MHZ, BUT DME CTL HEAD WAS INADVERTENTLY LEFT IN 'HOLD' PSN (LOCKING DME TO SSR RATHER THAN I-JDL) & CREW BEGAN A PREMATURE DSCNT.JUNEAU WX WAS IN PART: 600' SCATTERED, 3000' OVERCAST, 7 MI VISIBILITY. PIC WAS CURRENTLY FLYING BOTH LEARJET & DHC-7.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

FLIGHT/NAVIGATION INSTRUMENT(S)..IMPROPER USE OF

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

BECAME LOST/DISORIENTED..INADVERTENT..PILOT IN COMMAND

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

DESCENT..PREMATURE

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

UNSAFE/HAZARDOUS CONDITION..NOT IDENTIFIED..COPILOT/SECOND PILOT

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

PROPER ALTITUDE..NOT MAINTAINED..PILOT IN COMMAND


Contributing Factors

COMM/NAV EQUIPMENT,DISTANCE MEASURING EQPT(DME)..NOT SWITCHED


Contributing Factors

HABIT INTERFERENCE..PILOT IN COMMAND


Contributing Factors

LIGHT CONDITION..DARK NIGHT


Contributing Factors

WEATHER CONDITION..CLOUDS


Contributing Factors

TERRAIN CONDITION..MOUNTAINOUS/HILLY


Contributing Factors

TERRAIN CONDITION..RISING

Index for Oct1985 | Index of months