Narrative:

Illegal departure due equipment.flew VOR based departure procedure without RNAV (arear navigation) or GPS (global positioning system); as required by NOTAM (notice to airman)arrived to the plane (aircraft X) in preparation for flight from ZZZ to ZZZ1 and discovered both fmcs (flight management computers)were deferred. The captain and I discussed the conduct of the flight without the use of either FMC. I reviewed the route of flight based on short range navigation. The release showed that we were filed for the SID departure; which required we depart runway X; straight out until reaching 19 DME from ZZZ VOR; then turn to a heading and intercept an inbound course to VOR.DME information was not present on the ground; I assumed it would be present in the [air] because of terrain features in the area. I noticed there was no DME information after takeoff. The captain suggested using FMC navigation data for the turn. Following the turn; I switched back to heading select in combination with short range navigation (navigation).upon closer inspection and cross check; the following details were discovered;1) SID; which is a VOR based departure; had a NOTAM; 'SID departure...takeoff runway X na except for aircraft equipped with suitable RNAV system with GPS; ZZZ TACAN out of service'2) right DME not receiving DME from any sourcea clearance via the SID departure made sense to me; as it was a VOR based departure. I believed all components of the departure were functioning since that is how we were cleared. I also believed that short range navigation would be sufficient to fly the departure legally since that is the equipment the departure was predicated on; and the absence of any notes requiring RNAV equipment on the departure procedure.the oversight is easy to understand when considering that clearance via a departure procedure based on short range navigation was expected due to lack of RNAV capability. Clearance via the SID would not raise any red flags regarding the lack of GPS equipment required as the departure is not based on RNAV equipment. The failure is not a single source failure; as these details were missed by dispatch; flight crew; and ATC; as they cleared us via a departure requiring RNAV when; to the best of my knowledge; the RNAV related equipment codes were removed.spend a little more time reviewing details; such as notams; especially during abnormal procedures.given the lack of GPS equipped aircraft; file departure procedures not requiring GPS; as a matter of general practice.

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Original NASA ASRS Text

Title: Flight Crew flying 767-300 aircraft report using illegal departure procedure.

Narrative: Illegal departure due equipment.Flew VOR based departure procedure without RNAV (Arear Navigation) or GPS (Global Positioning System); as required by NOTAM (Notice To Airman)Arrived to the plane (Aircraft X) in preparation for flight from ZZZ to ZZZ1 and discovered both FMCs (Flight Management Computers)were deferred. The Captain and I discussed the conduct of the flight without the use of either FMC. I reviewed the route of flight based on short range navigation. The release showed that we were filed for the SID departure; which required we depart Runway X; straight out until reaching 19 DME from ZZZ VOR; then turn to a heading and intercept an inbound course to VOR.DME information was not present on the ground; I assumed it would be present in the [air] because of terrain features in the area. I noticed there was no DME information after takeoff. The Captain suggested using FMC navigation data for the turn. Following the turn; I switched back to heading select in combination with short range NAV (Navigation).Upon closer inspection and cross check; the following details were discovered;1) SID; which is a VOR based departure; had a NOTAM; 'SID DEPARTURE...TAKEOFF RWY X NA EXCEPT FOR AIRCRAFT EQUIPPED WITH SUITABLE RNAV SYSTEM WITH GPS; ZZZ TACAN OUT OF SERVICE'2) Right DME not receiving DME from any sourceA clearance via the SID departure made sense to me; as it was a VOR based departure. I believed all components of the departure were functioning since that is how we were cleared. I also believed that short range NAV would be sufficient to fly the departure legally since that is the equipment the departure was predicated on; and the absence of any notes requiring RNAV equipment on the departure procedure.The oversight is easy to understand when considering that clearance via a departure procedure based on short range NAV was expected due to lack of RNAV capability. Clearance via the SID would not raise any red flags regarding the lack of GPS equipment required as the departure is not based on RNAV equipment. The failure is not a single source failure; as these details were missed by dispatch; flight crew; and ATC; as they cleared us via a departure requiring RNAV when; to the best of my knowledge; the RNAV related equipment codes were removed.Spend a little more time reviewing details; such as NOTAMs; especially during abnormal procedures.Given the lack of GPS equipped aircraft; file departure procedures not requiring GPS; as a matter of general practice.

Data retrieved from NASA's ASRS site 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.