A cargo handling system for restraining a unit load device comprising: a structural channel having a hollow interior ; at least one locking mechanism associated with said structural channel , the locking mechanism being movable to engage the unit load device wherein the locking mechanism includes a first, outer pawl rotatable about an axis defined by a first pin and a second, inner pawl rotatable about an axis defined by a second pin pm ; and a motor assembly coupled to the second pin and to the at least one locking mechanism , the motor assembly being operable to automatically move the at least one locking mechanism upon detection of the unit load device at or approaching a desired position adjacent the at least one locking mechanism, wherein the motor assembly further comprises: a housing assembly coupled the structural channel ; a drive mechanism positioned within the housing assembly ; and a rotatable shaft associated with the drive mechanism , the shaft being coupled to the second pin , wherein the shaft is arranged coaxially with the second pin ; wherein the drive mechanism is movable relative to the housing assembly to selectively decouple the shaft from the second pin ; and wherein the motor assembly further comprises: a lever coupled to the drive mechanism , a portion of the lever extending outside of the housing assembly ; and a biasing mechanism disposed within the housing assembly adjacent the drive mechanism , wherein a biasing force of the biasing mechanism biases the shaft into engagement with the second pin . a structural channel having a hollow interior ; at least one locking mechanism associated with said structural channel , the locking mechanism being movable to engage the unit load device wherein the locking mechanism includes a first, outer pawl rotatable about an axis defined by a first pin and a second, inner pawl rotatable about an axis defined by a second pin pm ; and a motor assembly coupled to the second pin and to the at least one locking mechanism , the motor assembly being operable to automatically move the at least one locking mechanism upon detection of the unit load device at or approaching a desired position adjacent the at least one locking mechanism, wherein the motor assembly further comprises: a housing assembly coupled the structural channel ; a drive mechanism positioned within the housing assembly ; and a housing assembly coupled the structural channel ; a drive mechanism positioned within the housing assembly ; and a rotatable shaft associated with the drive mechanism , the shaft being coupled to the second pin , wherein the shaft is arranged coaxially with the second pin ; wherein the drive mechanism is movable relative to the housing assembly to selectively decouple the shaft from the second pin ; and wherein the motor assembly further comprises: a lever coupled to the drive mechanism , a portion of the lever extending outside of the housing assembly ; and a biasing mechanism disposed within the housing assembly adjacent the drive mechanism , wherein a biasing force of the biasing mechanism biases the shaft into engagement with the second pin . a lever coupled to the drive mechanism , a portion of the lever extending outside of the housing assembly ; and a biasing mechanism disposed within the housing assembly adjacent the drive mechanism , wherein a biasing force of the biasing mechanism biases the shaft into engagement with the second pin . <EOS>