Narrative:

I was requested to go to ZZZ to assist and to provide guidance on the number 2 engine change on the aircraft. I arrived in ZZZ and was escorted to the hanger. The engine was still attached to the pylon; so I helped the station people hook up the boot-strap kit. We lowered the engine and prepped the replacement engine for install. By this time; there was no rii (required inspection items) person in the hanger and since I was not involved with the maintenance actions other than guidance and assistance; I became the rii for most of the install. I did my normal process of looking the engine over and the gathered 'to be reinstalled' parts and hardware. I always make sure the forward mount spacers are installed since they are installed from inside the clevis. The engine was lifted and if I remember correctly; we were have a little difficulty getting the engine aligned to accept the mounting bolts and pins. I was assisting with the push and pull; moving engine around to get it aligned and we finally got the pins in. The 'missing' sleeves are under the head of the bolt and cannot be seen after the bolt is fully installed in the clevis and I probably assumed they were installed with the bolt since they were not on the table where the hardware was. There is no way of verifying the install unless the pin is pulled out a little or seeing them installed on the bolt at the time of bolt install. This now being hindsight; I should have followed up questioning the mechanic and should have re-verified their install. There is no excuse for missing this from the install.I have been involved in; probably; 9-10 engine changes; at the company. It has usually been with a more experienced team; so I was too relaxed in my approach this time by assuming the mechanic installed them. I have read the steps of the task card every time; but again; I did not physically verify the install.

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Original NASA ASRS Text

Title: A Maintenance Technician reported that during an engine change on an Embraer EMJ he neglected to verify if sleeves were installed on the engine mounts per the job cards.

Narrative: I was requested to go to ZZZ to assist and to provide guidance on the Number 2 engine change on the aircraft. I arrived in ZZZ and was escorted to the hanger. The engine was still attached to the pylon; so I helped the station people hook up the boot-strap kit. We lowered the engine and prepped the replacement engine for install. By this time; there was no RII (Required Inspection Items) person in the hanger and since I was not involved with the maintenance actions other than guidance and assistance; I became the RII for most of the install. I did my normal process of looking the engine over and the gathered 'to be reinstalled' parts and hardware. I always make sure the Forward Mount Spacers are installed since they are installed from inside the clevis. The engine was lifted and if I remember correctly; we were have a little difficulty getting the engine aligned to accept the mounting bolts and pins. I was assisting with the push and pull; moving engine around to get it aligned and we finally got the pins in. The 'missing' sleeves are under the head of the bolt and cannot be seen after the bolt is fully installed in the clevis and I probably assumed they were installed with the bolt since they were not on the table where the hardware was. There is no way of verifying the install unless the pin is pulled out a little or seeing them installed on the bolt at the time of bolt install. This now being hindsight; I should have followed up questioning the mechanic and should have re-verified their install. There is no excuse for missing this from the install.I have been involved in; probably; 9-10 engine changes; at the company. It has usually been with a more experienced team; so I was too relaxed in my approach this time by assuming the mechanic installed them. I have read the steps of the task card every time; but again; I did not physically verify the install.

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.